通过绿肥还田条件下免施基肥的氮肥深度减量试验,研究了稻季田面水氮素含量、氮素径流损失及水稻产量的变化.结果表明:在太湖地区绿肥还田模式下,追施150 kg·hm-2无机氮,与施基肥相比,不施基肥可以大大降低田面水的氮素浓度,减少了17.2%的氮素径流流失,且作物产量提高了2.8%.无机氮肥仅作追肥的施肥方式是可行的,但过量减施或增施无机氮肥均不能获得最高的产量.在太湖地区尝试紫云英还田条件下免施基肥,同时补充133 kg·hm-2无机氮作追肥,既可以大大减少无机肥的投入、保证水稻产量,也可以减少稻田氮素的排放量,实现水稻产量效应和环境效应的协调. Through nitrogen fertilizer depth reduction experiments on fertilizers without fertilizers under field conditions, the changes of nitrogen and nitrogen runoff losses and paddy yield in paddy field were studied. The results showed that under the mode of green manure return in Taihu Lake, 150 kg · hm-2 inorganic nitrogen, compared with the basal application, the non-application of base fertilizer can greatly reduce the nitrogen concentration of surface water and reduce the runoff loss by 17.2%, and the crop yield increased by 2.8% Top-dressing fertilization method is feasible, but over-reduction or addition of inorganic nitrogen fertilizer can not get the highest yield.In the Taihu Lake region to try to avoid the application of basal fertilizer, supplemented with 133 kg · hm-2 inorganic nitrogen Top dressing can not only greatly reduce the input of inorganic fertilizers, ensure the yield of rice, but also reduce the nitrogen emission of paddy so as to achieve the coordination of rice yield and environmental effects.