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研究了黄土高原半干旱地区中肥旱地小麦三个模拟降水、两种施氮量、两种施肥方式对小麦产量的影响。分析了在不同水肥组合下的光能利用效率、投肥增产效益及水分利用效率,得出了各指标对水肥的反应曲线。研究表明400~600mm降水范围内,随水分投入的增加,光能利用率、水分利用率、氮肥生产效果与产量大幅度提高。不同降水年型投入氮肥的生产效果差异较大,总的趋势是在丰水年型(600mm降水),氮肥投入效果显著;欠水年型(400mm),亩施15Kg尿素增产效果明显,再增加氮肥投入,反而导致减产。
The effects of three simulated rainfalls, two nitrogen rates and two fertilization modes on the wheat yield were studied in semi-arid areas of the Loess Plateau. The light energy utilization efficiency, fertilizer production efficiency and water use efficiency under different water and fertilizer combinations were analyzed. The response curves of each index to water and fertilizer were obtained. The results show that within the rainfall range of 400-600 mm, with the increase of water input, the light energy utilization efficiency, water use efficiency, nitrogen fertilizer production efficiency and yield increase greatly. The effect of different nitrogen fertilization years on nitrogen fertilizer production is quite different. The general trend is that in the wet years (600 mm precipitation), the nitrogen fertilizer input effect is remarkable. In the dry years (400 mm), the yield of 15 kg urea is obviously increased and then increased Nitrogen input, but lead to cut.