Search

Biochar (BC) is presented as an amendment based on biomass pyrolysis residue that promotes an increase in the amount of beneficial bacterial and mycorrhizal communities and the quantity of elemental nutrients for plant fertility; in addition, by its characteristics, it provides recalcitrant carbon, generates physicochemical changes, such as an increase in pH, increase in water retention in soil and cation exchange capacity. Most studies about BC focus on evaluating the results in physicochemical variables into soils, however, few studies show and explain reasons because BC increases beneficial bacterial and mycorrhizal communities to plant growth, for this reason is necessary to selectively analysis to define the mechanisms between BC and microorganisms. This review examines publications of the last 12 years of research on BC in different databases (ScienceDirect, Scopus, Springerlink, SciELO, Google Scholar), focusing on the years (2020-2022), to elucidate the underlying mechanisms that let the interaction between BC-soil microbial communities and its benefits as an agricultural amendment. An accepted hypothesis is the high porosity into BC that serves as a “microhabitat” since it allows ideal conditions of space, temperature, humidity, air, and food growing levels of rhizobacteria and mycorrhizal fungus involved in the solubilization of nutrients such as N, P and K increasing the exo-enzymatic activity of dehydrogenase, β-glucosidase, urease between others improving soil fertility and plant growth. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ciencia y Tecnología Agropecuaria is the property of Agrosavia 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.)

In order to recover, even partially, the memory of the intense relations that existed among the different Arawá people in the middle Purus region, this article explores, through the intertwining of human and plant life, the sociality that was broken, the stories that were once shared, but also the bonds that are still flourishing in the forests. The forester science, attentive to plants and anthropic vestiges present in the forests, shows unsuspected ways to analyze the complex relationships between the Hi-Merimã, who are now in isolation, and their neighbors, especially the Jamamadi. In this text, we propose an analysis of the narrative of an encounter through notes that demonstrate the centrality and fecundity of plants for the understanding of Hi-Merimã sociality and territorial dynamics. The notes are based on bibliographic data from anthropological, archeological and botanical studies, as well as information obtained from the indigenous peoples and river communities in the area. [ABSTRACT FROM AUTHOR]

The aim of this study was to estimate the foliar concentrations in cocoa farming (Theobroma cacao L) as a diagnostic tool of their nutritional status. At the Research Center of the National Federation of Cocoa Producers (Fedecacao) located in Miranda-Cauca, Colombia, the study assessed the effect of five doses of NPK fertilization in nutrient concentration in leaves of four cocoa clones CCN-51, TSH-565, ICS-39, and ICS-95 from 20102012. Experimental design was randomized complete block design with five treatments: TR(control), T1(25% NPK), T2(50% NPK), T3(75% NPK), T4(100% NPK) and four replicates. The concentration of 11 nutrients (N, P, K+, Ca2+, S, Mg2+, B, Zn2+, Cu2+, Fe2+, Mn2+) and their relation with yield was evaluated for three years. Results showed differences in the foliar concentration of nutrients assessed by effect of treatments, by clone, and by clone*treatment interaction. The foliar concentration used was derived from higher yield-related treatment, whereby, a proposal for nutritional diagnosis in cocoa based on nutrient monitoring was created to evaluate nutrient concentration in leaves. [ABSTRACT FROM AUTHOR]

This work is part of an intensive Program of Genetic Improvement in Musa spp. through hybridizations, which holds the Research Institute of Tropical Viandas (INIVIT). For this were conducted pollen fertility tests in different cultivars of bananas and plantains and it was studied a set of combinations from preselected male and female parents from National Germplasm Bank of Musa, it is conserved “ex situ" in areas of Institute, with the objective of to determine male and female fertility in some clones and the most efficient combinations to obtain new hybrids. It was obtained as a result that the highest rates of fertility were for bananas cultivars (AA) ‘SH-3142' (95.1 %), ‘SH-3362' (94.4 %). ‘Calcuta–4' (99.1 %), ‘Paka' (96.5 %) and ‘Pisang Jary Buaya' (98.1 %), the latter reported by first time under our conditions as a new male parent and they were successful in obtaining hybrid most combinations made between cooking bananas and synthetic diploid or improved (‘SH- 3362' and ‘SH-3142'). Triploid cultivar ‘FHIA-25', to show fewer fertile grains (17.6) and produce seeds in all combinations, reaffirms its status as maternal line. [ABSTRACT FROM AUTHOR]

The study was developed at Sierra Maestra, Cubanacán, Agricola Vueltabajo and Caribe farms, all belonging to «Los Palacios» Rice Agroindustrial Complex in Pinar del Río province, where three rice commercial varieties were evaluated (INCA LP-5, J-104 y Reforma) with the objective to analyze the behavior of these under different fertility conditions, during the cold season of 2005-2006. The obtained data were processed by means of simple classification analysis with bifactorial arrangement. The results showed that the INCA LP-5 variety had a good behavior, independently of the place where it was sowed; J-104 variety had the worse results, mainly for yields in Agrícola Vueltabajo and Caribe farms, being these and those of Reform variety, less to the national means in all the studied areas. In Sierra Maestra and Cubanacán areas, the best results in the whole Rice Agroindustrial Complex of Pinar del Río were reached. [ABSTRACT FROM AUTHOR]

Copyright of Universidad & Ciencia is the property of Universidad Juarez Autonoma de Tabasco 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.)

With the objective of evaluating of nutrient availability; its structure and water-air relationship under different management in inceptisol soil. The present work was carried out in the Experimental Agricultural Station "Alvaro Barba Machado". Three samplings were carried out in 2004, 2006 and 2007. They took four areas: two were planted with Leucaena leucocephala established 2 and 3 years old; one with natural grass and another with permanent crop. In all areas it were carried out chemical and physical analysis of soil, to depth of 0-10cm, 10-20cm and 20-40cm and an experiment under controlled conditions was developed, using corn as indicative plant. For statistical analysis was used the software STATGRAPHICS Plus 4.1 and SPSS ver. 8 on Windows 2000. The use of the tree Leucaena leucocephala cv Perú in an agricultural system increases the active layer of soil, this was expressed in the improvement of the soil states until 40cm of depth, such as matter organic, stable aggregate, structure factor and phosphor assumable. [ABSTRACT FROM AUTHOR]