【摘 要】
：
旱地条件下,施肥提高冬小麦生育前期土壤含水量和土壤水势,而在冬小麦接近成熟和收获时,施肥处理的土壤含水量和土壤水势均低于对照,从而使冬小麦吸收利用更多的土壤水分。施
【机 构】
：
西北农业大学,西北农业大学,西北农业大学 陕西杨陵712100,陕西杨陵712100,陕西杨陵712100
论文部分内容阅读
旱地条件下,施肥提高冬小麦生育前期土壤含水量和土壤水势,而在冬小麦接近成熟和收获时,施肥处理的土壤含水量和土壤水势均低于对照,从而使冬小麦吸收利用更多的土壤水分。施肥增大早地冬小麦绿叶面积和延迟叶片衰老,从而降低土壤蒸发,增加蒸腾用水潜势和光合潜势,但净同化率不一定提高。施肥增加旱地冬小麦总的水分利用(ET)和蒸腾用水(T),增加地上部生物产量,同时,旱地施肥增加冬小麦的每株有效分蘖数和每穗粒数,增加籽粒产量。因此,冬小麦的水分利用效率提高。
Under the conditions of dry land, fertilization increased the soil moisture content and soil water potential during the early growth period of winter wheat, while the soil water content and soil water potential under fertilization treatments were lower than that of the control during winter wheat maturity and harvesting, which made winter wheat absorb and utilize more soil moisture. Fertilization increased early winter wheat leaf area and delayed leaf senescence, thus reducing soil evaporation, increasing transpiration water potential and photosynthetic potential, but the net assimilation rate may not increase. Fertilization increased the total water use (ET) and transpiration water (T) of winter wheat in dryland to increase the aboveground biomass, and meanwhile, dryland fertilization increased the effective tiller number per plant and grains per spike and increased grain yield in winter wheat. Therefore, the water use efficiency of winter wheat is improved.
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