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在甘肃河西绿洲灌区,通过田间试验研究了增施绿肥7500kg/hm2后减施无机N肥施用量对小麦产量、经济性状、土壤肥力和土壤微生物数量的影响。结果表明,绿肥+70%N处理比当地农民习惯施肥模式(FFP)增产829～1525kg/hm2,增产率为10.7%～22.9%,且土壤碱解N、速效P、速效K和有机质含量均较高,能显著促进土壤微生物尤其是细菌的活动,较农民习惯施肥处理细菌数量增加62.8%。增施绿肥7500kg/hm2可降低施用无机N肥67.5kg/hm2左右,并能提升土壤肥力,增加小麦产量,具有较好的经济效益和生态效益。
In the Hexi Oasis irrigation area of Gansu, the effects of different application rates of inorganic N fertilizers on wheat yield, economic traits, soil fertility and soil microorganisms were studied through field experiments with 7500 kg / hm2 of green manure. The results showed that the green manure + 70% N treatment increased the yield of 829 ~ 1525 kg / hm2 and increased the yield of 10.7% ~ 22.9% than that of the local farmers. The content of soil available alkali N, available P, available K and organic matter High, can significantly promote the activity of soil microorganisms, especially bacteria, peasants used to fertilize bacteria increased by 62.8%. The application of green manure 7500kg / hm2 can reduce the application of inorganic N fertilizer 67.5kg / hm2 or so, and can enhance soil fertility and increase wheat yield, with good economic and ecological benefits.