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"Invulnerability" of complex network was firstly introduced to virtual water (VW) research, aiming to broaden the scope of studies on water use and management. Beginning with the construction of China's virtual water trade networks (VWTNs) of major grain crops, Node Degree (K) and Betweenness Centrality (B) are employed to evaluate and rank the importance of China's 31 regions. Regions with high values for both indicators are identified as playing pivotal roles in the VWTNs: Jiangsu (ranking 1st for both K and B), Hubei (2nd for K, 3rd for B), Henan (3rd for K, 6th for B), Hebei (4th for K, 4th for B), Hunan (4th for K, 5th for B). Using this ranking to simulate the invulnerability of VWTNs under random and intentional attacks. The results reveal a rapid decrease in both Network Efficiency (E) and Maximum Connectivity (C) under intentional attack. In comparison to seven random attacks, E falls below 0.1 and C drops below 0.5 after only three intentional attacks, and the network completely collapsed after 10 intentional attacks. This highlights the VWTN's vulnerability in maintaining food supply and agricultural water security when key regions are subjected to man‐made destruction, such as military blockades or occupations. Future work should include integrating climate change models, crops yield models, and water resource allocation models to protect the key areas. Furthermore, interdisciplinary approaches are crucial for overcoming the limitations of VW research and these findings will provide valuable insights to enhance the optimal regulation of VWTNs. Key Points: "Invulnerability" was novelly introduced to the virtual water trade networks (VWTNs) to simulate its destruction resistanceNetwork efficiency and maximum connectivity of VWTNs decreased rapidly under intentional attacksWhen key regions subjected to man‐made attacks, China's VWTNs is unable to maintain food supply and agricultural water security [ABSTRACT FROM AUTHOR]

The main challenges facing the agricultural sector in Sistan plain include scarcity of water resources, inadequate water rationing, and suboptimal cultivation patterns. Based on this, the main objective of this study was to determine the optimal cultivation pattern of agricultural crops by considering the virtual water and water footprint and assessing the impact on water consumption in this region. To achieve this objective, virtual water indicators and green, blue and gray water footprints of agricultural crops were calculated to quantify water consumption in the Sistan region. Then, considering the virtual water and water footprint, the optimal pattern of plant cultivation was determined using a fuzzy ideal programming model. The optimization model results were tested based on a system dynamics approach in the Vensim PLE8.3.5 software. The results showed that the virtual water content of agricultural products in this region was 2.69 m3/kg. The annual water requirement of agricultural crops was 1019 MCM, of which 62% is met. After optimizing the cultivation pattern, the water requirement reduced to 600 MCM per year, of which 89% is supplied. Additionally, the optimization of cultivation patterns increased water supply to the environmental sector from 138 to 240 MCM per year.

Agricultural water productivity is crucial for sustainability amidst the escalating demand for food. Cereals are pivotal in providing nutritious food at affordable prices. This study was based on Ghanaian data spanning from 1992 to 2021 to evaluate water usage in the cultivation of major cereals. It also examined the virtual water losses or gains in cereal trade alongside influencing factors. The analysis utilized secondary data encompassing the virtual water content, production quantity, export and import quantities, distance, GDP per capita, population, and land per capita of Ghana and its 75 trade partners. In the last 5 years, crop water use (CWU) reached an average of 7.08 billion m3/yr for maize, 3.48 billion m3/yr for rice, 1.08 billion m3/yr for sorghum, and 0.63 billion m3/yr for millet production. Ghana's major partners for exported virtual water (EVW) were Niger, Burkina Faso, South Africa, and Togo. Major partners for imported virtual water (IVW) were Argentina, South Africa, Ukraine, Togo, Russia, Burkina Faso, Canada, Senegal, Nigeria, Portugal, UK, Niger, and the USA. The Panel Least Squares Method of regression was used to apply the Gravity Model principle in assessing influencing factors. The findings indicate that Ghana is a net importer of virtual water in the cereal trade, with significant influences from geographical distance, GDP per capita, population, land per capita, and cereal water use. [ABSTRACT FROM AUTHOR]

Incorporating water footprints and virtual water into crop redistribution provides a new approach for efficient water resources utilization and synergistic development of water surplus and scarce regions. In this work, the absolute and comparative advantage of the production‐based blue and gray water footprint (PWFblue and PWFgray), the calorie‐based blue water footprint (CWFblue) and the net benefit‐based blue water footprint (NBWFblue) were used as coefficients to establish a bi‐level crop redistribution model. The mode considers upper‐level decision makers interested in maximizing food security and ecological security and lower‐level decision makers interested in water use efficiency, water use benefits and net benefits. The model was applied in the Hetao Irrigation District (HID), China. The results showed that after optimization, the PWFblue, CWFblue, NBWFblue, and gray water footprint (GWF) of the HID were reduced by 23.32%, 5.60%, 17.40%, and 6.67%, respectively. National benefits were improved, especially when considering synergistic optimization, although the net benefits of HID was affected. The calorie supply increased by 9.6 × 109 kcal, the GWF decreased by 8.29 × 106 m3, and water use efficiency and benefits were improved in China. In contrast, the calorie supply and the net benefits of the HID decreased, while the GWF increased. Moreover, multiple stakeholders were involved in crop redistribution and required national synergies. The bi‐level model proved more suitable than the multi‐objective model. The model proposed in this work considers synergies outside the region in crop redistribution within the region, and can provide new insight for water and soil resources management in arid and semi‐arid regions. Key Points: Virtual water flow embedded in optimization model reflecting comparative advantageAbsolute advantage and comparative advantage synergize interregional interestsBi‐level optimization model trade‐offs regional authority and sub‐regions [ABSTRACT FROM AUTHOR]

Civil infrastructure underpins urban receipts of food, energy, and water (FEW) produced in distant watersheds. In this study, we map flows of FEW goods from watersheds of the contiguous United States to major population centers and highlight the critical infrastructure that supports FEW flows. To do this, we draw upon detailed records of agriculture, electricity, and public water supply production and couple them with commodity flow and infrastructure information. We also compare the flows of virtual water embedded in food and energy commodity flows with physical water flows in inter‐basin water transfer projects around the country. We found that the virtual blue water transfers through crops and electricity to major US cities was 53 billion and 8 billion m3 in 2017, respectively, while physical interbasin water transfers for crops, electricity, and public supply water averaged 20.8 billion m3. Highways are the primary infrastructure used to import virtual water associated with food and fuel into cities, although waterways and railways are most utilized for long‐distance transport. All of the 204 watersheds in the contiguous US support the food, energy, and/or water supplies of major US cities, with dependencies stretching far beyond each city's borders. Still, most cities source the majority of their FEW and embedded water resources from nearby watersheds. Infrastructure such as water supply dams and inland ports serve as important buffers for both local and supply‐chain sourced water stress. These findings can inform efforts to reduce water resources and infrastructure risks in domestic supply chains. Key Points: Civil infrastructure enables US cities to access FEW resources from distant watershedsMost cities depend on nearby watersheds for FEW and embedded waterVirtual water transfers through food and energy exceed physical water transfers [ABSTRACT FROM AUTHOR]

Study region: The Yellow River Basin (a water-deficient region) in China. Study focus: The redistribution of virtual water through trade holds potential to enhance water security in the Yellow River Basin. We explored a virtual water tri-circulation model at the city level to mitigate water stress in the Yellow River Basin. The tri-circulation model includes internal, external and international virtual water flows. This research investigated the heterogeneity of virtual water trade between upstream and downstream regions, identified key regions and sectors to facilitate physical water redistribution and enhance regional cooperation. New hydrological insights for the region: This study revealed that the Yellow River Basin received virtual water amounting to 8.40 % of its total virtual water consumption, with external circulation being the key circulation. Upstream regions primarily exported water resources to downstream regions and developed regions outside through agricultural trade, while downstream regions received water from upstream regions and underdeveloped regions outside through trade in agri-food products and other service industries. International circulation exported virtual water through water-intensive agricultural products, contributing to increased local environmental burden. Increased attention should be paid to virtual water transfers of the external circulation, implementing compensation strategies, and fostering technical interaction between upstream and downstream regions, and safeguarding upstream agricultural and ecological water to promote the sustainable development of the Yellow River Basin.

Given the need for water use to be a crucial consideration in sustainable development, an adequate water allocation system across economic sectors is essential, especially in the face of increasing seasonal and perennial water scarcity. In an attempt to facilitate a socially and economically efficient adaptation to the climate emergency, we propose a set of eleven socio-economic indicators to analyze the current water management. This set of indicators could help to quantify the interrelationship between water use and its economic perspective, as well as its social perspective through its impact on employment. Any demand for water not only includes the direct use of water but also its indirect use, referred to as virtual water. This is the water indirectly used through the other inputs in the production process (input–output methodology). These indicators are evaluated in the South-West Europe territory where, in light of increasing water scarcity, there is a need to orientate water allocation toward employment with less intensive water use, to more water productivity and to less environmental impacts. The results at river basin scales show that water use is more productive in the tertiary than in the secondary and primary sectors. [ABSTRACT FROM AUTHOR]

In response to the growing disparity between the supply and demand of water resources, the Chinese government has piloted a more binding and reformed water resources tax to realize the sustainable utilization of water resources. However, reasonable tax standards and their water-saving effects and economic benefits are important and worthy of attention. Therefore, in this study, we combine the virtual water theory with the price input–output model to discuss the impact of water resources taxation on the economy and its water-saving effects. The results show the following: (1) A water resources tax has a significant water-saving effect, and is predicted to save 33.12 billion cubic meters of virtual water. (2) Consumers' expected reductions in spending on food and tobacco manufacturing and agriculture are predicted to save more virtual water at a lower economic cost. (3) The collection of water resources taxes can actively and simultaneously guide water savings in terms of consumption and production. The water consumption of the construction industry is worthy of attention. The expected output value reduction accounts for 67.2% of the total output value reduction, and its water savings account for 96% of the total water savings. Other service sectors also have ample room to optimize the utilization of their water resources. [ABSTRACT FROM AUTHOR]

Abstract Civil infrastructure underpins urban receipts of food, energy, and water (FEW) produced in distant watersheds. In this study, we map flows of FEW goods from watersheds of the contiguous United States to major population centers and highlight the critical infrastructure that supports FEW flows. To do this, we draw upon detailed records of agriculture, electricity, and public water supply production and couple them with commodity flow and infrastructure information. We also compare the flows of virtual water embedded in food and energy commodity flows with physical water flows in inter‐basin water transfer projects around the country. We found that the virtual blue water transfers through crops and electricity to major US cities was 53 billion and 8 billion m3 in 2017, respectively, while physical interbasin water transfers for crops, electricity, and public supply water averaged 20.8 billion m3. Highways are the primary infrastructure used to import virtual water associated with food and fuel into cities, although waterways and railways are most utilized for long‐distance transport. All of the 204 watersheds in the contiguous US support the food, energy, and/or water supplies of major US cities, with dependencies stretching far beyond each city's borders. Still, most cities source the majority of their FEW and embedded water resources from nearby watersheds. Infrastructure such as water supply dams and inland ports serve as important buffers for both local and supply‐chain sourced water stress. These findings can inform efforts to reduce water resources and infrastructure risks in domestic supply chains.

The regional comprehensive economic partnership (RCEP) is today the largest free trade area in the world. This paper examines agricultural trade in the RCEP from 2010 to 2019 through the perspective of virtual water. And the drivers of the virtual water flow between China and the RCEP are also explored. The results are as follows: the virtual water flow during the study period was 2,576.51 billion m3. From a temporal perspective, the annual virtual water flow over the study period is characterized by a slow rise–significant fall–slow rise. It has the characteristics of concentration in spatial distribution and water resources and product structure. However, the concentration degree showed a downward trend during the study period. Then, we have divided the major trading into four categories based on whether there is a shortage of water on both sides of the trade. In terms of the drivers of virtual water flows between China and the RCEP, we have used the gravity model to arrive at the following findings: crop yields, bilateral economic scale, and agricultural labor resources are the main drivers. Our research results have reference values for adjusting bilateral agricultural trade and water conservation. HIGHLIGHTS The virtual water flow has the characteristics of spatial concentration.; The virtual water trade relations are divided into four categories.; The structure of the virtual water flows is relatively concentrated.; The driving factors are analyzed by using the gravity model.;

Copyright of Revista Latinoamericana de Estudios Rurales is the property of ALASRU / CEIL-CONICET and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study utilizes a system dynamics approach (SD) to assess the effects of water productivity improvement strategies on the Qazvin plain, Iran, and the uncertainty of the individual and interactive effects. The key indicators included in the important strategies are cropping pattern scenarios (CPS), deficit irrigation (DI), and modern irrigation systems development (MISD). Plain-scale results show that CPS 7, CPS 4, and CPS 8 had the highest physical water productivity (WPp) at 2.11, 1.99, and 1.95 kg/m3, respectively, representing a 21, 14, and 12 percent increase over CPS 1. Compared with CPS 1, CPS 4, CPS 6, and CPS 8 showed the highest values of WPe (5678, 5568, and 5503 Rials/m3, respectively). At the field scale, under DI, WPp increased for all crops (except corn, which was the most sensitive), but WPe is only increased for tomato, canola, pea, and barley and reduced for corn, potato, beans, lentils, and sugar beet. The WPe was affected by the DI, the irrigation system type, and the CPS. CPS 7 and CPS 6 had the highest and lowest water requirements, respectively, with 11,699 and 8207 m3/ha. Volume decline in aquifers is significantly affected by both CPS and DI. The CPS6, CPS8, and CPS2 were better than other scenarios. By modifying the cropping pattern, it is possible to prevent aquifer decline, thus improving the aquifer status (CPS5). MISD increased both field and plain WPp for all crops. The MISD improved groundwater resources and reduced demand by increasing efficiency to improve aquifer condition. [ABSTRACT FROM AUTHOR]

Abstract This study utilizes a system dynamics approach (SD) to assess the effects of water productivity improvement strategies on the Qazvin plain, Iran, and the uncertainty of the individual and interactive effects. The key indicators included in the important strategies are cropping pattern scenarios (CPS), deficit irrigation (DI), and modern irrigation systems development (MISD). Plain-scale results show that CPS 7, CPS 4, and CPS 8 had the highest physical water productivity (WPp) at 2.11, 1.99, and 1.95 kg/m3, respectively, representing a 21, 14, and 12 percent increase over CPS 1. Compared with CPS 1, CPS 4, CPS 6, and CPS 8 showed the highest values of WPe (5678, 5568, and 5503 Rials/m3, respectively). At the field scale, under DI, WPp increased for all crops (except corn, which was the most sensitive), but WPe is only increased for tomato, canola, pea, and barley and reduced for corn, potato, beans, lentils, and sugar beet. The WPe was affected by the DI, the irrigation system type, and the CPS. CPS 7 and CPS 6 had the highest and lowest water requirements, respectively, with 11,699 and 8207 m3/ha. Volume decline in aquifers is significantly affected by both CPS and DI. The CPS6, CPS8, and CPS2 were better than other scenarios. By modifying the cropping pattern, it is possible to prevent aquifer decline, thus improving the aquifer status (CPS5). MISD increased both field and plain WPp for all crops. The MISD improved groundwater resources and reduced demand by increasing efficiency to improve aquifer condition.

【Objective】 This paper aims to assess the indirect influence of virtual water flow on metropolitan-scale agricultural water stress in Sichuan province. It investigates the spatiotemporal variation in this context, elucidating how persistent growth in agricultural water use and the movement of virtual water through agricultural products across the province indirectly impacts regional water stress. 【Method】 The AquaCrop model was employed to calculate the water footprint of 16 different crops from 2000 to 2018 in all metropolitan cities within the province. The calculation of inter-province virtual water flow was based on annual balance between crop production and food demand, by considering the minimum transportation costs cross the province. These calculated results were then used to analyze the influence of virtual water flow on agricultural water stress. 【Result】 From 2000 to 2018, the average water footprint of crop production in Sichuan was estimated to be 28.4 billion cubic meters per year. The total water footprint of crop production in the province exhibited a fluctuation during the studied period, with the most notable change observed in Leshan. The province experienced a net increase in virtual water inflow, with the Western areas receiving more inflow than the Eastern regions. The continuous influx of virtual water has contributed to the alleviation of agricultural water stress in the province, reducing the number of cities experiencing increased water stress due to virtual water outflows from four in 2000 to one in 2018. 【Conclusion】 The analysis of physical and virtual water highlights the need for Sichuan province to enhance the regulation and optimization of virtual water trade as a means to mitigate agricultural water stress.

This article aims to find out the impact of water in the process of sustainable agricultural development in Iraq, by presenting the reality of water resources in Iraq and water sources with reference to water sources globally and at the level of the Arab world, the low efficiency of the use of water resources in Iraq, which was considered one of the biggest challenges that led to the depletion of this important and vital resource, as it did not exceed in the best cases 40%, which is a small percentage if compared to neighboring countries and the Arab homeland. Moreover, the study did not indicate any trend to use virtual water as a more rational alternative to importing water between the high costs of water and its transportation, and it was also shown through the study that there are many challenges that affected water management in Iraq, including water share and water security, as well as shared water with neighboring and upstream countries. The study recommended supporting and encouraging the use of modern irrigation systems (sprinklers) to raise the efficiency of water use and link water security with food security because of their major role in raising the process of sustainable agricultural development in Iraq As well Aa activating the rule aquatic Agricultural extension because of its role in guiding and guiding farmers in rationalizing the use of water resources and urging them to adopt modern irrigation technologies.

Agricultural water productivity is crucial for sustainability amidst the escalating demand for food. Cereals are pivotal in providing nutritious food at affordable prices. This study was based on Ghanaian data spanning from 1992 to 2021 to evaluate water usage in the cultivation of major cereals. It also examined the virtual water losses or gains in cereal trade alongside influencing factors. The analysis utilized secondary data encompassing the virtual water content, production quantity, export and import quantities, distance, GDP per capita, population, and land per capita of Ghana and its 75 trade partners. In the last 5 years, crop water use (CWU) reached an average of 7.08 billion m3/yr for maize, 3.48 billion m3/yr for rice, 1.08 billion m3/yr for sorghum, and 0.63 billion m3/yr for millet production. Ghana’s major partners for exported virtual water (EVW) were Niger, Burkina Faso, South Africa, and Togo. Major partners for imported virtual water (IVW) were Argentina, South Africa, Ukraine, Togo, Russia, Burkina Faso, Canada, Senegal, Nigeria, Portugal, UK, Niger, and the USA. The Panel Least Squares Method of regression was used to apply the Gravity Model principle in assessing influencing factors. The findings indicate that Ghana is a net importer of virtual water in the cereal trade, with significant influences from geographical distance, GDP per capita, population, land per capita, and cereal water use.

The management of water resources requires a correct understanding of the simultaneous management of food and energy resources. The framework of water–food–energy correlation with the approach of sustainability of resources and uses analyzes the combined management and exploitation of water, food, and energy resources with the help of scenario planning. In addition to sustainability concepts, environmental costs such as the emission of carbon dioxide from fossil fuels and its impact on the environment are also discussed. In this research, according to the five defined indicators and based on the potential of using solar energy and the possibility of exploiting renewable energy sources such as solar energy, various management scenarios have been developed. After examining the virtual water management model developed in the Hunan basin as a case study, the development of the water–food–energy nexus model and its calibration, and four scenarios including improving water use efficiency, energy saving, increasing food productivity, and nexus sustainability were developed. The results showed that the nexus strategy can provide sustainability goals according to the weight of each component. After the combined scenario, improving the efficiency of water consumption can be the component with the highest priority in the decision-making model in dry areas. HIGHLIGHTS The water–food–energy nexus is evaluated as a conceptual approach for achieving sustainable management.; Improving water use efficiency, energy saving, increasing food productivity, and nexus sustainability were considered.; The developed approach provides a significant contribution to achieving regional sustainable development goals.;

The escalating challenges regarding the sustainable utilization of coupled energy and water resources require the implementation of synergistic management. Electricity-related virtual water flows could result in the transfer of freshwater vulnerability and environmental inequalities. Aiming to systematically characterize its holistic patterns, network structure and formation mechanisms, we constructed a virtual water network for electricity trade in China based on provincial lifecycle water footprints; portrayed the statistical features, structural stability and interregional equilibrium using Complex Network Analysis (CNA); and introduced the Quadratic Assignment Procedure (QAP) to gain socio-environmental insights into the driving factors. The results show that the virtual water transferred with China's interprovincial electricity trade increased from 851.24 million m3 to 3441.58 million m3 from 2006–2020. Eastern, developed provinces with a high electricity demand have effectively relieved their water stress by expanding import sources, but the transfer of water resource benefits from western exporting regions (especially in the arid northern provinces) is irreversible. The current electricity market forces reflect the scarcity of energy and capital factors in the context of China's interprovincial trade, but not the scarcity of water resources. Consequently, we proposed integrated management strategies including strengthening sectoral collaboration, optimizing energy-use structures and establishing ecological compensation mechanisms to build a more water-efficient future power system. [ABSTRACT FROM AUTHOR]

Virtual water exerts an indispensable influence on water resources, yet the existing studies on the water rights allocation of transboundary rivers hardly consider virtual water transfer (VWT). Therefore, in this paper, we used Taihu Lake as an example with data collected in 2017 that described both physical and virtual water use. We used these data to evaluate water rights allocation schemes by coupling virtual and physical water use. In order to achieve this goal, we first determined the physical water rights allocated for the four regions connected to the Basin. Next, we employed the multi-regional input–output (MRIO) approach to calculate the VWT among the four regions; then, we converted the VWT to the riparian level via the water efficiency coefficient. Finally, with virtual water included in the physical water rights allocation, we formulated a final water rights allocation for Taihu Lake. The results showed the following findings: (1) The ranking of the amount of physical water rights allocation is: Jiangsu > Zhejiang > Shanghai > Anhui. (2) Anhui and Jiangsu produce a net export of virtual water (2.259 billion m3 and 1.78 billion m3, respectively), while Zhejiang and Shanghai have a net import of virtual water (2.344 billion m3 and 1.695 billion m3, respectively), indicating that Anhui houses more water-consuming industries and is in greater need of economic restructuring. (3) The integration of virtual water makes a difference: Jiangsu achieved 16.208 billion m3 in terms of the amount of water rights allocated, Zhejiang achieved 6.606 billion m3, Shanghai achieved 3.040 billion m3, and Anhui achieved 4.319 billion m3, with a ranking of Jiangsu > Zhejiang > Anhui > Shanghai. The results detailed above prove that virtual water exerts an indispensable influence, and integrating virtual water can make the physical water rights allocation of transboundary rivers more equal and reasonable. [ABSTRACT FROM AUTHOR]

IntroductionThe increase in demand for water resources due to population growth and economic development along with water wastage and a decrease in rainfall, on the other hand, has made it significant to pay attention to water demand and make sound policies. Our country is facing the risk of a water crisis in the coming years, mainly due to its location in a dry and semi-arid climate, as well as the ever-increasing growth of water consumption. To alleviate the water crisis, international trade in agricultural products can play a significant role in redistributing water resources because traded goods contain a large amount of virtual water. Water restriction in Iran is an undeniable fact, for this purpose, trading based on virtual water can be a solution to reduce the effects of water restriction. Due to being located in a dry and semi-arid climate, Iran is facing the risk of a water crisis in the coming years. Therefore, in order to deal with it, it is necessary to be more sensitive to the types of water consumption. Among these uses is virtual water. The water used in the production process of goods is called virtual water, a part of which is kept in the product. Virtual water trade occurs when goods are imported into global markets. Virtual water trading is expected to reduce water consumption at the national and international levels due to more efficient and specialized use of water. Today, the concept of virtual water is one of the most critical issues in water resources management. Today, the problem of water shortage has become a serious concern due to climate changes and uneven distribution of rainfall in most regions and countries, including Iran, and is considered the most important obstacle to the economic development of these countries. Trade as a tool to prevent the unnecessary withdrawal of water resources, focusing on the strategy of virtual water trade, can play an essential role in achieving the economic development of countries. Materials and Methods The study area of the research is the Shiblo-Poldasht plain in the northwest of Iran. This area is located in the east of the Poldasht study area and in the north of the Qara Ziauddin study area. The aim of this research was to investigate the statistical status of the cultivated area, the production performance, and the evaluation of the productivity and virtual water of agricultural crops in the Poldasht plain. The time frame of the research is from 2011 to 2021 in an 11-years period. Accurate calculation and determination of water requirement (m3 ha-1). The amount of water required by a plant for its proper growth, taking into account the loss of evaporation and transpiration of the plant, is called the water requirement of the plant. Therefore, the water requirement of the plant depends on the amount of evaporation and transpiration of the plant. It is worth noting that due to different climates and weather conditions, plant growth conditions and as a result, the amount of water needed by plants are also different. In the present research, the various productivity indicators and virtual water of the crops of Dasht-Poldasht have been examined. Moreover, according to the objectives of the research, the physical and financial indicators of water productivity, including the performance index per unit of water volume (CDP), income per unit of water volume (BPD), and net return per unit of water volume (NBPD) have been calculated. Results and Discussion In this research, the amount of virtual water and the productivity index as well as the net and gross economic value of the major crops grown in Poldasht city in West Azarbaijan province were investigated. In this regard, first, data and information related to crops were collected through relevant organizations and institutions, and NETWAT, CROPWAT, and CLIMWAT programs and Excel programs were used to draw graphs and graphical results. Then the yield of crops was calculated by dividing the amount of crops produced by the area of ​​planting crops and the productivity index and virtual water. The results of this research show that the watermelon crop with a harvesting area of ​​5789 ha and a production rate of 237951000 kg and a production yield of 41103.99 kg ha-1 with a water requirement of 2760 m3 ha-1 has a productivity of 14.89 kg m-3 and has The highest level of productivity is also the results show that the alfalfa product is the lowest level of productivity. It is worth noting that despite the fact that the watermelon product has high production and productivity at a very low harvest level, it is also a very water-loving product that has a relatively high water requirement, and generally experts are looking for an alternative product due to the lack of water resources. Finally, it is suggested that traditional (submerged) irrigation methods should be replaced by modern pressurized irrigation methods so that in addition to increasing efficiency and productivity, we can see a reduction in water consumption and its wastage. It is also suggested that the water requirements of agricultural crops be compared with each other using the data of the Agricultural Jihad Organization and the aforementioned programs, and its effect on the amount of water consumed and its savings, as well as the net and gross values ​​of the production of crops, and the final results It is compared with the national water document to fully verify the amount of water needed. Conclusion Despite the fact that the watermelon product has high production and productivity at a very low harvest level, it is also a very water consuming product possessing a relatively high water requirement, and generally experts are looking for an alternative product, due to the lack of water resources. Finally, it is suggested that traditional flood irrigation methods should be replaced by modern pressurized irrigation methods, so that in addition to increasing efficiency and productivity, we can encounter with a reduction in water consumption and its wastage. It is also suggested that the water requirement of agricultural crops should be compared with each other using the data of the Agricultural Jihad Organization and the aforementioned programs, and its effect on the amount of water consumed and its saving, as well as the net and gross values of crop production, should be evaluated. Finally, the results have been compared with the national water document so that the amount of water needed can be fully verified.

Given the need for water use to be a crucial consideration in sustainable development, an adequate water allocation system across economic sectors is essential, especially in the face of increasing seasonal and perennial water scarcity. In an attempt to facilitate a socially and economically efficient adaptation to the climate emergency, we propose a set of eleven socio-economic indicators to analyze the current water management. This set of indicators could help to quantify the interrelationship between water use and its economic perspective, as well as its social perspective through its impact on employment. Any demand for water not only includes the direct use of water but also its indirect use, referred to as virtual water. This is the water indirectly used through the other inputs in the production process (input–output methodology). These indicators are evaluated in the South-West Europe territory where, in light of increasing water scarcity, there is a need to orientate water allocation toward employment with less intensive water use, to more water productivity and to less environmental impacts. The results at river basin scales show that water use is more productive in the tertiary than in the secondary and primary sectors.

Agricultural trade, which involves the exchange of virtual water and land resources, can effectively regulate the allocation of resources among countries while enhancing the well-being of resource-rich and resource-poor nations. China's animal products trade market concentration is greater, and the livestock industry consumes more water than other agricultural sectors. In order to alleviate the pressure on China's domestic water and land resources and to ensure that Chinese residents have access to animal products, this article examines the trade situation and drivers of virtual water and land resources related to Chinese animal products trade. This study used the heat equivalent method to measure the virtual water and land flows of the import and export of beef, pork, and mutton from 1992 to 2018, which is followed by the gravity model to investigate the factors impacting China's flow of virtual land and water related to livestock products trade. We found that the economic development and the agricultural resources of exporters, as well as China's agricultural employment rates, have a stable beneficial impact on China's livestock imports. The population of importing nations, China's cultivated land area, and the livestock production index of importers and exporters have a positive impact on the export of livestock products from China. Our results remain robust following a series of additional tests. [ABSTRACT FROM AUTHOR]

Virtual water exerts an essential effect on water resources, yet such effect is rarely considered in current studies on water rights allocation in transboundary rivers. Hence, this paper ran a case study on Taihu Lake Basin, collecting data from 2017 to make clear the physical water rights of four regions—Jiangsu Province, Zhejiang Province, Anhui Province, and Shanghai City—in the Basin. After that, the multiregional input–output (MRIO) approach was utilized to measure the trade in value-added (TiVA) transfer and virtual water transfer (VWT) and construct an inequality index of VWT (VWI). Next, water efficiency coefficient was employed to convert the VWT into riparian level. Finally, VWT and VWI were incorporated into the water rights allocation model to form up a water rights allocation scheme for Taihu Lake Basin. Results showed: (1) Jiangsu enjoys the most allocated physical water rights, followed by Zhejiang, and Anhui ranks the lowest; (2) Anhui and Jiangsu are net virtual water exporters (2.259 billion m3 and 1.78 billion m3, respectively), while Zhejiang and Shanghai are net importers (2.344 billion m3 and 1.695 billion m3, respectively); (3) Anhui suffers the most inequality—0.4401—followed by 0.5076 of Jiangsu, while Zhejiang has the most equal environment—0.7012; (4) after the inclusion of virtual water, the quantity of water rights allocation changes, whereas Anhui experiences the largest growth—144 million m3—due to the dual effects from the highest VWT and inequality. In conclusion, the effect of virtual water is indispensable, so VWT and VWI should both be considered in the physical water rights allocation of transboundary rivers. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Kirkuk University for Agricultural Sciences is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

As a water-scarce country and the world's largest trader of industrial products, China's industrial virtual water (VW) flow may exacerbate its water scarcity problem. Thus, industrial VW flows' spatial and temporal evolution in international trade should be analyzed, and influencing factors must be identified. This study developed the multiregional input–output (MRIO) model, combined with the Leontief inverse matrix, to measure and decompose the industrial VW flows between China and other economies from 2000 to 2014. This extended MRIO model considers intermediate production water consumption and indirect water use, which technically distinguishes the sources of pressure on water use more accurately, thus enabling a new elaboration of the composition of China's industrial water use. Then, the evolution of China's industrial VW trade is analyzed spatiotemporally, and the structural decomposition analysis (SDA) method is invoked to identify the endogenous drivers further. The results indicate the following. (1) China was a net exporter of industrial VW trade. The main VW export sectors in China were the manufacture of textiles and wearing apparel, paper products, and chemical products, which had the characteristics of high water consumption, high pollution, and low added value, respectively. (2) The net exports of industrial VW from China mainly went to the US, EU, ROW (rest of the world), and Japan. China's VW exports to the US and Japan are declining, while exports to the EU and Russia are increasing. (3) The decrease in the water-use coefficient in all industrial sectors in China was the most critical reason for inhibiting the increase in the country's industrial VW exports. The export structure effect of intermediate products, product structure effect of foreign final demand, and scale effect of foreign final demand were the primary reasons for the rise in VW exports, but all gradually diminished. Moreover, the structural effects of China on the use of domestic intermediate products had a significant positive effect on the increase in VW exports. In contrast, those of foreign products had an extremely weak effect. [ABSTRACT FROM AUTHOR]

To achieve food security goals, water accounting seems to be one of the most powerful tools to deal with water scarcity management. Thus, indicators, such as virtual water and water productivity, can be considered complementary rather than competing indicators to assess water demand efficiency use. Water computation is, therefore, a crucial tool to understand the overall tendency of water consumption and to assist the decision makers in their decisional process about water efficiency use in different phases of production. In this perspective, this paper aims to evaluate water use throughout the value chain of the olive oil sector, which is the first strategic agro-industrial sector in Tunisia. This evaluation will be undertaken while taking into account various crucial issues concerning the main two production phases in terms of the importance of water consumption (agriculture and processing phase). In the agriculture phase, the rainfed and irrigated modes will be compared, and in the processing phase, three different processing systems will be evaluated. Thirty surveys with farmers and nine surveys with olive oil mill owners were undertaken in the arid region of Sfax: one of the most important olive oil producers in Tunisia. The results show the importance of the theoretical framework adopted in clarifying the state of water consumption in a strategic sector, such as the Tunisian olive oil sector. In addition, the different calculated indicators highlight the importance of the application of a whole technical package and a controlled and efficient use of water to improve the economic profitability and the necessity to revise the irrigated olive growing extensions' policies under arid conditions. In addition, in the processing phase, the continuous-two phase system is emphasized as the most relevant system in terms of water efficiency use. This system is proposed to be encouraged by policy makers in future olive mill installations. [ABSTRACT FROM AUTHOR]

Introduction Agriculture has played a vital role in the economy, life, and culture in the civil history of Iranians. In recent years, this sector is the largest consumer of freshwater resources in this country. One of the adaptive ways to deal with the water shortage is the optimal use of water. In the production process of a commodity, different sources of water may be used, and the type of water supply source can play a significant role in the analysis of virtual water trade. In the period of 2016-2018, previous research covered by the Moghan irrigation network has been conducted in the field of physical and economic water productivity indicators estimation of crops. Moreover, in previous studies, only benefit per drop (BPD) and net benefit per drop (NBPD) indices have been used to estimate the economic productivity of agricultural water. Therefore, in this research, the agricultural year 2020-2021 was studied in order to investigate the physical and economical water productivity indicators of crops covered by the Moghan irrigation network. Materials and Methods The Moghan Plain is located in the northwestern part of Iran, on the west side of the Caspian Sea, and north of Ardabil province, on the border between Iran and the Republic of Azerbaijan. The total area of the Moghan watershed is more than 5545 km2. The altitude of the region is 50 to 600 m above sea level and its climate is semi-arid and moderate. Most of the agricultural farm covered by Moghan's irrigation and drainage network is devoted to cultivating crops such as wheat, barley, seed corn, fodder corn, soybean, rapeseed, rice, tomato, cotton, sugar beet, and peanut. In this research, these products' virtual water content and physical and economic water productivity are investigated. In this research, to complete the previous studies in the aforementioned field, the virtual water content of the studied products has also been investigated. In addition to the BPD and NBPD, the unit virtual water value (UWV) has been studied to further investigate the Moghan irrigation network economic efficiency of water crops. Results and Discussion The content of gray, blue, green, and white virtual water of the studied crops, sugar beet, tomato, and fodder corn, have the lowest content of gray virtual water among crops. Among the studied crops, fodder corn, tomato, and sugar beet products, respectively, have the highest physical water productivity, and rice, soybean, cotton, and peanut respectively have the lowest physical water productivity. Regarding gross value index per unit of irrigation volume among the studied crops tomatoes, peanuts, fodder corn, barley, and wheat, respectively have the; highest, moreover peanut, tomato, cotton, fodder corn, and sugar beet products, respectively, have the highest net value index per unit of irrigation volume among the studied crops, however, barley, wheat, rice, and grain corn, respectively, have the lowest net value index per unit of irrigation volume among the studied crops. In addition, tomatoes, peanuts, fodder corn, wheat, and barley have the highest index of value per virtual water unit among the studied crops, respectively, while rice has the lowest value index per virtual water unit among the studied crops. According to the BPD index, tomatoes, peanuts, fodder corn, barley, and wheat are the first to fifth priorities for cultivation in the Moghan Plain. The first to fifth priorities for cultivation in the Moghan plain according to the NBPD index are peanuts, tomatoes, cotton, fodder corn, and sugar beet, and based on the UWV index, tomatoes, peanuts, fodder corn, wheat, and barley are the first to fifth priorities. Conclusion In the current research, the content of virtual water and the amount of physical and economic water productivity of crops covered by the Moghan irrigation network were calculated. The crop per drop (CPD) index of rice shows the last level in the crop year 2020-2021 due to the amount of water consumed and the significant cost. Also, in the analysis of the BPD and NBPD index, this product has the lowest and ninth priority, respectively, and in the current water shortage conditions in the Moghan Plain, there is a need to review the cultivation of this product. Tomatoes and fodder corn have good productivity in all three indices of CPD, BPD, and NBPD in the crop year 2020-2021. In fact, while tomato does not have a low water requirement, measuring the performance of this product shows the high net and gross profit obtained according to the cost of planting and harvesting. The amount of UWV index of wheat, rapeseed, soybean, rice, fodder corn, seed corn, tomato, barley, sugar beet, cotton, and peanut products is 24269, 15644, 18894, 9956, 36279, 17362, 50073, 23010, 21748, 19403, and 45718 rials per m3, respectively. The proposed approaches and models of this research are different depending on whether the index of physical productivity or economic productivity of water is considered in planning and policy-making.

This article aims to show that virtual water has historically been an adaptation strategy that enabled some arid regions to develop a prosperous economy without putting pressure on their scarce water resources. Virtual water is referred to as the total amount of water that is consumed to produce goods and services. As an example, in arid central Iran, the deficiency in agricultural revenues was offset by more investment in local industries that enjoyed a perennial capacity to employ more workers. The revenues of local industries weaned the population from irrigated agriculture, since most of their raw materials and also food stuff were imported from other regions, bringing a remarkable amount of virtual water. This virtual water not only sustained the region’s inhabitants, but also set the stage for a powerful polity in the face of a rapid population growth between the 13th and 15th centuries AD. The resultant surplus products entailed a vast and safe network of roads, provided by both entrepreneurs and government. Therefore, it became possible to import more feedstock such as cocoons from water-abundant regions and then export silk textiles with considerable added-value. This article concludes that a similar model of virtual water can remedy the ongoing water crisis in central Iran, where groundwater reserves are overexploited, and many rural and urban centers are teetering on the edge of socio-ecological collapse. History holds an urgent lesson on sustainability for our today’s policy that stubbornly peruses agriculture and other high-water-demand sectors in an arid region whose development has always been dependent on virtual water.

Water is a natural source that in addition to being required for development aims, is necessary for survival. After agriculture, the industry is one of the main water consumers in Iran. One of the main water consumer industries is cement production. However, no study is still conducted on the virtual water trade in the cement industry in Iran. In this paper, the virtual water trade between Iran and 68 countries importing cement from Iran and 40 countries to which Iran has exported cement was investigated. The time period of the current research was from 2001 to 2018. The results showed that the virtual water export of cement was 15.385 × 106 m3/yr. The total virtual water export of cement was calculated to be 276.940 × 106 m3. Virtual water imports of cement are 0.147 × 106 m3/yr. Iran is a net exporter of virtual water. For the production and export of cement in Iran, 70% blue water and 30% gray water are used.

Based on a comparative study of several conflicts between village communities and gold mining companies (in Latin America and West Africa) over the use of water, this article argues that the analysis of the status of the water/gold couple in current ethical issues leads to the recognition of the rights of some of elements of the Nature. To do so, it points out how the ecological transition imposed by climate change and various environmental ethics are currently apprehended. He also demonstrates the difficulty of estimating the "virtual water" of gold: a difficulty that reveals the inadequacy of classical environmental ethics and the limits of orthodox economics. An ethics of gold that is equal to the current ecological stakes could lead to a radical revision of the epistemological bases of our representations of the world.

Introduction The increase in demand for water resources due to population growth and economic development along with water wastage and a decrease in rainfall, on the other hand, has made it significant to pay attention to water demand and make sound policies. Our country is facing the risk of a water crisis in the coming years, mainly due to its location in a dry and semi-arid climate, as well as the ever-increasing growth of water consumption. To alleviate the water crisis, international trade in agricultural products can play a significant role in redistributing water resources because traded goods contain a large amount of virtual water. Water restriction in Iran is an undeniable fact, for this purpose, trading based on virtual water can be a solution to reduce the effects of water restriction. Due to being located in a dry and semi-arid climate, Iran is facing the risk of a water crisis in the coming years. Therefore, in order to deal with it, it is necessary to be more sensitive to the types of water consumption. Among these uses is virtual water. The water used in the production process of goods is called virtual water, a part of which is kept in the product. Virtual water trade occurs when goods are imported into global markets. Virtual water trading is expected to reduce water consumption at the national and international levels due to more efficient and specialized use of water. Today, the concept of virtual water is one of the most critical issues in water resources management. Today, the problem of water shortage has become a serious concern due to climate changes and uneven distribution of rainfall in most regions and countries, including Iran, and is considered the most important obstacle to the economic development of these countries. Trade as a tool to prevent the unnecessary withdrawal of water resources, focusing on the strategy of virtual water trade, can play an essential role in achieving the economic development of countries. Materials and Methods The study area of the research is the Shiblo-Poldasht plain in the northwest of Iran. This area is located in the east of the Poldasht study area and in the north of the Qara Ziauddin study area. The aim of this research was to investigate the statistical status of the cultivated area, the production performance, and the evaluation of the productivity and virtual water of agricultural crops in the Poldasht plain. The time frame of the research is from 2011 to 2021 in an 11-years period. Accurate calculation and determination of water requirement (m3 ha-1 ). The amount of water required by a plant for its proper growth, taking into account the loss of evaporation and transpiration of the plant, is called the water requirement of the plant. Therefore, the water requirement of the plant depends on the amount of evaporation and transpiration of the plant. It is worth noting that due to different climates and weather conditions, plant growth conditions and as a result, the amount of water needed by plants are also different. In the present research, the various productivity indicators and virtual water of the crops of Dasht-Poldasht have been examined. Moreover, according to the objectives of the research, the physical and financial indicators of water productivity, including the performance index per unit of water volume (CDP), income per unit of water volume (BPD), and net return per unit of water volume (NBPD) have been calculated. Results and Discussion In this research, the amount of virtual water and the productivity index as well as the net and gross economic value of the major crops grown in Poldasht city in West Azarbaijan province were investigated. In this regard, first, data and information related to crops were collected through relevant organizations and institutions, and NETWAT, CROPWAT, and CLIMWAT programs and Excel programs were used to draw graphs and graphical results. Then the yield of crops was calculated by dividing the amount of crops produced by the area of planting crops and the productivity index and virtual water. The results of this research show that the watermelon crop with a harvesting area of 5789 ha and a production rate of 237951000 kg and a production yield of 41103.99 kg ha-1 with a water requirement of 2760 m3 ha-1 has a productivity of 14.89 kg m-3 and has The highest level of productivity is also the results show that the alfalfa product is the lowest level of productivity. It is worth noting that despite the fact that the watermelon product has high production and productivity at a very low harvest level, it is also a very water-loving product that has a relatively high water requirement, and generally experts are looking for an alternative product due to the lack of water resources. Finally, it is suggested that traditional (submerged) irrigation methods should be replaced by modern pressurized irrigation methods so that in addition to increasing efficiency and productivity, we can see a reduction in water consumption and its wastage. It is also suggested that the water requirements of agricultural crops be compared with each other using the data of the Agricultural Jihad Organization and the aforementioned programs, and its effect on the amount of water consumed and its savings, as well as the net and gross values of the production of crops, and the final results It is compared with the national water document to fully verify the amount of water needed. Conclusion Despite the fact that the watermelon product has high production and productivity at a very low harvest level, it is also a very water consuming product possessing a relatively high water requirement, and generally experts are looking for an alternative product, due to the lack of water resources. Finally, it is suggested that traditional flood irrigation methods should be replaced by modern pressurized irrigation methods, so that in addition to increasing efficiency and productivity, we can encounter with a reduction in water consumption and its wastage. It is also suggested that the water requirement of agricultural crops should be compared with each other using the data of the Agricultural Jihad Organization and the aforementioned programs, and its effect on the amount of water consumed and its saving, as well as the net and gross values of crop production, should be evaluated. Finally, the results have been compared with the national water document so that the amount of water needed can be fully verified. [ABSTRACT FROM AUTHOR]

The paper investigates the influence of major food corporations on global rice and coffee markets from 2013 to 2022, with a focus on market presence and water usage. It uses detailed data from the Euromonitor Passport and the CWASI datasets to analyze environmental impacts and virtual water (VW) flows at the company level, addressing gaps in the existing literature. Key findings show that although rice sales are larger than those of coffee in quantity, coffee embeds a higher total water use due to its greater unit water footprint (WF). The rice market is less internationalized and concentrated compared to the coffee market, where a few companies hold significant market shares across multiple countries. In 2022, the top 12 rice-selling companies control 16% of the global rice WF, exceeding the combined WF of the top three rice-importing nations. Similarly, the top 15 coffee-selling companies command 55% of the global roasted coffee WF, with significant disparities in VW quantities compared to major importing nations. The coffee market exhibits a higher number of companies with larger shares of WF than volumes, with this disparity increasing over time. Furthermore, more countries exhibit high and moderate concentration indices for coffee sales compared to rice. These findings highlight the considerable concentration of water resources among large companies, particularly in the coffee sector. The paper emphasizes the importance of considering the environmental implications of corporate activities in food supply chains, providing valuable insights for sustainability efforts in the agri-food industry.

China and India's miraculous economic growth has undoubtedly improved the livelihoods of millions of people, but it has also increased demand for already scarce water resources in the region. The hydro-political relationship between the two countries is particularly interesting due to China’s hold of the Tibetan Plateau which houses the heads of most major rivers in the region. China’s general unwillingness to cooperate with their downstream neighbors has become cause for concern, especially for India’s growing economy and population. This study analyzes the quantitative economic and resource consumption changes of China and India since 1980 to demonstrate the sharp changes linked to export-oriented economic development. These data are supported by a holistic analysis of key domestic policy changes as well as current domestic water-related issues in order to fully grasp the current circumstances and hypothesize the potential for escalation to conflict. Using Feron’s rationalist framework, I analyze the key sources of conflict as credibility problems, incomplete information and the indivisible nature of water. These three issues work cyclically and feed into one another, any solution for the issue would have to acknowledge all three elements. This study suggests that domestic water efficiency improvements such as increased water-recycling and smarter irrigation infrastructure coupled with bilateral solutions like joint hydraulic projects on the Brahmaputra and codified data sharing agreements can foment cooperation between the nations. This thesis ultimately establishes a link between the globalization-led development in the region and India and China’s changing hydraulic needs in order to determine the actions necessary to avoid international conflict and ensure long-term water and energy security for both states.

This study was conducted with the aim of calculating the water footprint of the major agricultural products of Isfahan city, Iran and determining the optimal cultivation pattern from the perspective of water footprint and virtual water. To conduct the research, the water requirement of major agricultural products in Isfahan was calculated using CropWat 8 software. Then, the average volume of water consumption, virtual water, water footprint, and water use efficiency of these products for the statistical period 2011-2017 was calculated. The results showed that oilseeds and legumes had the highest water footprint. Forage plants, summer crops, and vegetables had the highest water use efficiency and the lowest water footprint, respectively. Accordingly, the cultivation of oilseeds in Isfahan is not recommended. In the group of wheat grains, in the group of plants, fodder, corn, forage, in the group of vegetables, onions, and in the group of summer vegetables, watermelon with 1815.52, 1720.5, 127949 and 2621,63 m3/ha respectively is recommended for cultivation in Isfahan region due to having less water footprint. Due to recent droughts and water shortages, available water resources should be used in the best way, and crops with lower water requirements and higher yields should be planned.

Tracking unseen water in products (Embedded Virtual Water) has generated great interest in the scientific community. This water transfers between geographies via suppliers, manufacturers, distributors, retailers and customers in multiple phases. However, the Virtual Water Trading System lacks proper accounting standards, established protocols and processes in the context of product manufacturing. Therefore, there is a need to establish a technology platform to handle the complex virtual water international trade. Such a platform should uphold transparency and create ‘water consciousness’ and awareness among companies and consumers. The concept of a virtual water currency and blockchain technology platform together can manage these processes. Blockchain helps in setting up secure, verifiable, scalable and traceable systems. Blockchain manages the audit and contract management processes with ease. Virtual water currency is critical to advocate sustainability. The objective of this paper is to establish the key linkages between virtual water and usage of blockchain. A systematic literature survey was conducted on 16 journal repositories (153 journal papers) of IWA Publishing to establish virtual water linkages and five journal databases (IEEE Xplore, Sciencedirect, ACM Digital Library, Springer Link and Wiley Online Library covering 5026 journal papers) for blockchain and water management linkages. This study proposes to introduce virtual water currency and set up an International Virtual Water Trading System using blockchain. The proposed platform seamlessly integrates the quality, cost and sustainability of industrial products and their sub-components. HIGHLIGHTS Virtual water trading in the context of product manufacturing lacks proper accounting and sensitization. Therefore, it is important to set up a technology platform to build water consciousness and awareness among companies and consumers.; Virtual water currency plays a profound role in building sustainability.; Blockchain technology helps in setting up a secure, verifiable, scalable and traceable system.;

Globally, agriculture is the primary water consumption sector. This study used water footprint (WF) as a bottom-up tool and satellite imagery as a top-down tool to estimate the internal water use (WU) in the agricultural sector in an innovative way to show the effects of water-intensive use in agriculture in an arid country. The WF of Iran has been quantified for 19 main crops and for related agricultural products exported from Iran to partner countries. Using a bottom-up approach, Iran's total yearly agriculture net water consumption is estimated to be 42.43 billion cubic meters (BCM) per year. Out of 42.43 BCM total net internal water use, only 1.61 BCM is virtual-water export related to these 19 products, and the remaining 40.82 BCM is for internal use. Our results using satellite imagery show that in case of using all possible lands for agriculture, it would require 77.4 BCM. However, not all these lands are within human reach, and the maximum available water is way lower than this amount. Using satellite imagery, the total evaporation from agricultural lands shows 55.27 BCM for 2020, which agrees with national reports during 2005–2014. This study shows that agricultural water consumption tends to use internal water resources at a maximum level for export and national use, significantly impacting renewable and non-renewable water resource availability, especially in groundwater.

Multiple factors need to be considered when allocating water resources, among which water scarcity risk is often ignored. However, the unmet water demand of upstream sectors with high water dependency will exacerbate water scarcity, and lead to potential economic risk to the industrial chain. To solve it, we propose a method to quantify the intermediate virtual water scarcity risk transfer via the intermediate use matrix and Leontief inverse matrix, and apply it to virtual water trade in China in 2018. Meaningful conclusions are drawn as follows: (i) Although the water-use efficiency of all sectors in China increased steadily from 2007 to 2018, the overall input concentration of virtual water scarcity risk showed a rising trend, reflecting the gradual increase in the vulnerability of the industrial chain to water shortage. (ii) The virtual water scarcity risk in China mainly transferred through the secondary industry. The secondary industry accounted for 51.8% of the output and 71.8% of the input in the intermediate virtual water transfer, while 77.0% and 74.7%, respectively, in intermediate virtual water scarcity risk output and input. (iii) From 2007 to 2018, agriculture, chemical industry, metallurgy, electricity and heat supply always ranked as the top four of intermediate virtual water scarcity risk output sectors. As their downstream sectors, the construction industry, metallurgy, and other services are stable within the top four input sectors. (iv) The virtual water scarcity risk upstream transmitted is significantly dispersed after the intermediate inputs process, indicating that abundant import relationships are conducive to reduce the risk taken in. From the perspective of intermediate input, this paper argues that it is necessary to both ensure the water supply of the upstream source sectors and disperse the downstream import sources. Moreover, enriching industrial structures and closing production linkages between sectors is also beneficial for promoting sustainable economic development. [ABSTRACT FROM AUTHOR]

Copyright of Ciencia e Ingenieria Neogranadina is the property of Ciencia e Ingenieria Neogranadina and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Due to the increase in population, growing urbanization, and higher demands for processed and unprocessed foods, resources related to food production have become scarce. Water and land can be considered as the primary resources to determine the crop production potential of a country. Ideally, countries that lack water and land resources can import these in virtual form. Sri Lanka is a country rich in water resources that faced bankruptcy recently. This study analyzes and explores the potential for use of land–water resources in Sri Lanka. A comprehensive framework is generated to identify the virtual land–water trade by considering ten major imports and nine major export crops in Sri Lanka. Consequently, the top ten imports/exports and top ten import/export trade partners are identified. The analysis reveals that Sri Lanka is a heavily import-dominant country, having seven times higher imports compared to exports. The country imports wheat, which is 82% of its import crops, and the same crop is the largest export (85% of crop export). Compared to its trade partners, Sri Lanka has sufficient water resources, but availability of arable land is limited. Banana is the largest export of the country, which involves higher embedded water and less land, matching the resource availability to Sri Lanka, whereas the trade partners are expected to continue importing the crop due to their water and land stress conditions. Finalization of the long-awaited agriculture policy of the country is strongly recommended. [ABSTRACT FROM AUTHOR]

Realizing water usability and management sustainability represents one of the Sustainable Development Goals. Since grain cultivation consumes tremendous amounts of water, the inter-regional grain trade causes virtual water flow, increasing water stress in certain water-scarce regions. As the second-longest river in China, the Yellow River bears increasingly severe water stress. Considering water and food security, this study proposes a spatial equilibrium model (SEM) that combines partial equilibrium theory and transport models to maximize net social revenue and to balance grain supply and demand, thereby optimizing inter-regional grain trade to relieve water stress. According to different natural, technical and social conditions, we conceived five scenarios to predict regional water stress characterized with different water supplies, demographic structures, food demand compositions and water-saving technologies. Our simulation results suggest that the developed SEM can realize spatial equilibrium of food and water resources within the Basin, which is capable of resolving the problem of food demands in regions with varying extents (13%–55%), optimizing inter-regional grain trade and mitigating water stress. Finally, we recommend some constructive policies for different scenarios to relieve water stress. HIGHLIGHTS A spatial equilibrium model is developed to optimize the inter-regional grain trade.; The inter-regional virtual water flow in the Yellow River Basin is simulated.; The water stress under different projected scenarios is explored.; Effective policy recommendations for different scenarios are put forward for agricultural water-saving and alleviating regional water stress.;

Water is one of the most important components of sustainable life. However, the excessive use of this vital element has caused irreparable damage to the limited water resources, and the agricultural industry assumed as the largest amount of consumed water. In recent years, the significant reduction of water resources as well as the growing trend of drought necessitates a review and change in the agricultural induster. In this research the water requirement of agricultural plants of Mazandaran province including rice, wheat, barley and citrus is estimated in order to investigate the volume of green and blue virtual water, exported and imported water by these crops across the province. Meteorological data such as rainfall, maximum and minimum temperature, relative humidity, sundial of the area and information such as cultivation area, crops yield rate, exported and imported water volume collected from relevant agencies over the last ten years. FAO Penman-Monteith and USDA methods in CROPWAT software used to estimate virtual water and water needs. Results showed that rice, wheat, barley and citrus consumption accounted for the largest water requirement. Also, rice water requirement is blue water and wheat, barley and citrus plants consume green water sources which is not relocated and is not suitable for other purposes or storage. Consequently, due to the climatic potential of Mazandaran province, the pattern of cultivation alter to plants with low water requirements that are able to absorb their required water from green water sources, such as wheat, barley and citrus as well as lower plant area with abundant water requirement such as rice can save more water resources and the water crisis could be effectively in control.

Water scarcity has direct implications for food security in arid regions. Egypt faces an escalating situation of water scarcity, as its renewable fresh water resources are fixed and the population is growing rapidly. The per capita supply of fresh water is already dangerously low and predicted to plummet even further by the year 2025. This paper critically analyzes three different approaches to the water scarcity problem in Egypt: importing virtual water, using Nile water more efficiently, and creating new sources of fresh water with desalination. The advantages and disadvantages of each approach are reviewed. This exposes a number of fundamental trade-offs that must be resolved. Discussion and recommendations are made as to which solution is most viable.

Purpose. The purpose of the article is to determine the impact of domestic renewable water resources in the country on the formation of GDP, i.e to identify the relationship between the country's water potential and its economic growth in the future, due to the growth of water-intensive technologies in the world and agricultural development. Methodology / approach. The traditional and special research methods were used in the study, including: historical and logical – to analyze the dynamics of water use in the world and ways of forming the flow of virtual water; theoretical generalization, analysis and synthesis – to form an understanding of the “principle of globality of water problems” and derive consistent pattern of “principle of globality of water problems”; statistical analysis to assess the level of needs of countries (regions) in water resources and to assess the level of GDP of countries in comparison with their water potential; method of econometric analysis (correlation analysis and linear regression) – to prove the relationship between the water potential of the country and its economic growth in the future. Results. The main idea of the study is to identify the relationship between the country’s water potential and its economic growth in the future. It was found that almost all areas with the highest economic growth have the largest total number of inland renewable water resources. the knowledge and dynamics of virtual water trade in the world was described and summarized. According to the principles of the concept of “virtual water”, regions with water scarcity and spatial mismatch between water resources and the availability of arable land can increase their food security by meeting part of their food needs through trade in agricultural products and reducing local food production. A new principle of development of the territory “the principle of globality of water problems” has been substantiated in the study. It is determined that the very availability of domestic renewable water resources in the country does not have a significant impact on GDP growth, but the total catchment per capita in the country already has a significant impact on GDP, i.e, indeed, after reaching a certain water scarcity threshold, the country begins to demand for grain imports, which increases as water resources decrease. The consistent pattern of the “principle of globality of water problems” was proved mathematically, using econometric analysis. Originality / scientific novelty. The formation of the principles of territorial development was further developed, namely the “principle of globality of water problems” was formulated – the change of humanity's attitude to the water resource has formed an understanding of its limitations and possible global scenarios of world development. The development of the laws of economic theory was improved, namely the consistent pattern of the “principle of globality of water problems” – “axes (corridors) of development of the territory, which together with the poles of growth determine the spatial framework of economic growth, in the light of the globalization of water problems, are determined by the presence of the total number of domestic renewable water resources”. Practical value / implications. The results of the study allow a comprehensive assessment of the risks of the agricultural sector associated with the large-scale use of water resources and make effective management decisions on the development and implementation of water-efficient technologies in Ukraine and in the world. The study actualizes the thesis of infrastructure regulation as water-intensive technologies will require significant infrastructure projects and the appropriate quality of water and water supply and sewerage infrastructure as the basis of water efficiency of the region and the country.

The article presents an analysis of the water footprint of five Central and Eastern European countries, i.e. Poland, Slovakia, Lithuania, Ukraine and Belarus. The first three are members of the European Union, the other two are not. These countries also differ in terms of climate. The green, blue and grey water footprints of crop production, grazing, animal water supply, industrial production and domestic water supply are analysed. The per capita water footprint is also calculated. It is the highest for the countries of the former Soviet Union, that is Ukraine, Belarus and Lithuania, and half as low for Poland and Slovakia. In the case of virtual water, Poland dominates in the area of import, and Ukraine in export. The index of the net import of virtual water is unfavourable for Ukraine and Lithuania and is much more positive for Poland and Belarus. When calculated per capita, the net import of green virtual water is the highest for Belarus (340 m3/person/year) and Poland (148 m3/person/year). A positive value of this index was also recorded for Slovakia and negative for Lithuania and Ukraine (-282 m3/person/year). Taking into account the exposure of the southern Ukraine steppe to water stress, this is not a favourable situation for greater export of virtual water than its import.

The uneven distribution of water resources and production fragmentation make the study of water footprint an important part of water resources management and environmental research. This paper provides a bibliometrics analysis of 3822 papers related to the water footprint topic before 2021, including 2381 English papers from the Science Citation Index (SCI) database and 1441 Chinese papers from the China National Knowledge Infrastructure (CNKI) database. We applied the method of co-word analysis to study the changes in hot research fields in four stages and represented a comparative analysis of highly cited papers and the application of water footprint theory in various sectors. First, water footprint can be divided into two categories: “volumetric” water footprint and “impact-oriented” water footprint. “Volumetric” water footprint methodology focuses on water consumption while “impact-oriented” water footprint methodology focuses more on the environmental impact of water use. Water scarcity, carbon footprint, and grey water are the high-frequency keywords of both two databases. The research linkage of papers related to water footprint from the SCI database has gradually shifted to climate change and carbon emission, while, those from the CNKI database are more closely linked to ecological footprint and sustainable development. Second, SCI’s highly cited papers prefer to study the water footprint through scientific experiments from a bottom-up perspective, while CNKI’s highly cited papers prefer to combine economics and management theories to study the water footprint from a top-down perspective. In addition, water footprint theory is mainly applied in agriculture and industrial sectors and less in service sectors. This paper provides a review of water footprint research on a large scale and a reference for future research on water footprint.

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