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【Objective】 The present paper aimed to investigate the comprehensive effects of irrigation amount on soil enzyme activity, yield, quality and nutrient utilization of pepper in Sichuan Basin, and propose an appropriate irrigation amount. 【Method】 The pepper variety of Xingshuzhoula 3 was used as the experiment material. Four irrigation amount treatments were set, and the soil volumetric moisture content was controlled respectively at 35%-40% (T1), 45%-50% (T2), 55%-60% (T3), 65%-70% (T4). The soil urease, neutral phosphatase, sucrase β-Glucosidase activity and catalase activity such as yield, quality, and plant N, P, K content of peppers were determined. The interrelationship between the indicators was analyzed. 【Result】 The soil enzyme activities increased with the increase of irrigation amount. The soil urease, neutral phosphatase, sucrase, β-glucosidase and catalase activities of T4 were the highest, and the activities of some enzymes were not significantly different from those of T3.Compared with T1, the increases were 48.80%, 28.70%, 45.60%, 100.87% and 102.58%, respectively. With the increase of irrigation amount, pepper yield also increased, T4 increased by 29.05% compared with T1, and there was no significant difference in pepper yield between T3 and T4.The content of vitamin C and capsaicin in peppers decreased gradually with the increase of irrigation water, but the content of soluble sugar in peppers increased with the increase of irrigation water. The amount of irrigation increased the total accumulation of nutrients (N, P and K), the physiological use efficiency of N and K and the partial fertilizer productivity in pepper fruits and shoots. Except that the physiological utilization efficiency of P was lower than that of T4, the other nutrient utilization parameters of T3 were not significantly different from those of T4, and the physiological utilization efficiency of K was even significantly higher than that of T4.【Conclusion】When the irrigation amount is 4392-4733 t/hm² (T3 and T4), the soil enzyme activity, yield and nutrient utilization rate of pepper are all at high levels. The results of the study provide a theoretical and practical reference for the selection of the irrigation amount of facilities pepper in Sichuan Basin. [ABSTRACT FROM AUTHOR]

：In this study, we aimed to investigate the effect of amount of irrigation water under gravel-sand mulch conditions on hydrothermal parameters of soil and fruit yield of date palm forests in fallow gravel-sand mulched field. The field experiment was conducted in an arid zone in central Ningxia. To investigate the effects of gravel-sand mulch and irrigation on soil temperature, soil water storage, jujube fruit yield, and water use efficiency, we used two types of mulch（gravel-sand mulching（M）and bare soil（N））and three different amounts of irrigation water（low water：180 mm（W1）, medium water：210 mm（W2）, and high water：240 mm（W3））. The results showed that gravel-sand mulching increased the soil temperature at a depth of 0~10 cm by 0.8~3.1 ℃ compared with that of bare soil. The soil warming period（10：00—14：00）after gravel-sand mulching was significantly shorter than that of bare soil（8：00—14：00）, and the warming rate was 0.4 ℃·h-1 faster than that of the bare soil treatment. The method of mulching and the amount of irrigation water had a significant effect（P<0.05）on the amount of soil water stored at a depth of 0~80 cm during the entire fertility period of the jujube trees, and the gravel-sand mulching treatment increased by 10.97% on average with the amount of soil water stored compared with that of the bare soil treatment. The highest increase was 14.54% at the leaf bud stage, when the soil water content was low. The growth index, yield, and water use efficiency of jujube trees under gravel-sand mulch conditions were higher than those under bare soil, and the yield from high to low was W3>W2>W1, which increased by 5.99%, 10.54%, and 26.79%, respectively, compared with that of the bare soil treatment, with the highest water use efficiency of MW2 being 1.55 kg·m-3 . In condusion, the MW2 treatment is a suitable planting pattern for date palm forests on fallow and gravel-sand mulched field in the central arid zone of Ningxia. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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.)

Copyright of Journal of Irrigation & Drainage is the property of Journal of Irrigation & Drainage Editorial Office 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.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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 explore the irrigation index of winter wheat with sprinkling irrigation in North China, a 2-yeargrowing season(2010-2012) field experiment was carried out to investigate the effects of economic yield, grain quality and water use efficiency of winter wheat with different sprinkling irrigation. The results show that the different effects of water-deficits on biomass, economic yield, grain quality and water use efficiency based on the growing stages in which the water deficits are applied. There is no significantly decreased grain yield, but the grain quality water use efficiency and irrigation water use efficiency are significantly increased and the protein ratio and gluten ratio have been improved when water deficits applied during from turning green to elongation stage and grain filling of winter wheat. Comprehensive consideration economic yield, grain quality, water use efficiency especially irrigation water use efficiency, irrigation strategy of T2, T3 and T6 can be used as appropriate sprinkling irrigation mode for the local winter wheat. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 aims at discussing the effects of planting row spacing and irrigation amount on the plant growth, chlorophyll fluorescence parameters and yield of tomato, the purpose is to obtain the suitable arrangement of irrigation amount and planting row spacing for greenhouse tomato in Northwest China. The experiment was conducted in a solar greenhouse at the Green Lily fruit and vegetable cooperatives in Yangling Agricultural Hi-tech Industries Demonstration Zone in Shaanxi province from January to June in 2016. The cultivated variety of tomato in the experiment was HL2109. The treatments comprised three planting row spacing (L1(60 cm), L2(45 cm), L3 (30 cm))with 80 cm ridge distance and 35 cm plant spacing. Based on the cumulative evaporation from a 20 cm diameter pan between two irrigations (E), 0.6 E, 0.8 E, 1.0 E, 1.2 E were set as four different levels of irrigation amount, when the cumulative evaporation reached (20±3) mm, irrigation will be conduct. Twelve treatments were experimented totally and every treatment was replicated three times in randomized complete block designs. Based on the growth indexes, chlorophyll fluorescence parameters in different growth stages and the leaf area index, net photosynthetic rate of tomato plants during the critical period of yield formation, the effects of different row spacing and irrigation amount on tomato growth, photosynthetic physiological activities and yield were analyzed, and the relationship between different growth and physiological indexes with yield were studied. The results showed that tomato growth index: chlorophyll fluorescence parameters, net photosynthetic rate, yield and irrigation water use efficiency were all affected by both planting row spacing and irrigation amount in varying degrees, but there is no significant interaction between the two factors. Low planting row spacing treatment(L3) resulted in redundant plant growth and excessive LAI, thereby photosynthetic physiological activities of crop population were inhibited, finally causing lower yield and irrigation water use efficiency. Excessively low irrigation amount inhibited photosynthetic physiological activities and showed a cumulative effect of water stress with the growth period of tomato plants. By path analysis, LAI and Pn have the most direct impact on yield among the indicators, improving the Pn is an important way to increase crop yield. Plant height and stem diameter have a good regression relationship with leaf area index(P=0.004 6), plant with large stem diameter and low height has suitable leaf area index, which is beneficial to yield formation. The yield of tomato followed a downward quadratic parabola shape with the increase of irrigation amount and planting row spacing, however, when planting row spacing and irrigation amount reached 45 cm and 0.8E respectively, continuing to increase planting row spacing and irrigation amount would not significantly increase yield. Considering the irrigation water use efficiency and yield, L1-0.8E and L2-0.8E treatment were better than others. Compared with the highest yield treatment (L1-1.2E), L1-0.8E and L2-0.8E treatments can increase irrigation water use efficiency by 36.00% and 29.29% when yield reduced by only 4.28% and 9.00%. So, when the ridge distance is 80 cm and the plant spacing is 35 cm, the planting row distance selected 45-60 cm, the irrigation quantity is set to 0.8E would be the appropriate combination of irrigation amount and planting row spacing of greenhouse tomato in Northwest China. [ABSTRACT FROM AUTHOR]

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department 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.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture 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.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering 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.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering 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.)