通过在不同施肥水平条件下，种植冬季覆盖作物，研究了对免耕玉米的净收入和产量风险性的影响。种植豆类覆盖作物的免耕玉米，不施氮肥时净收入风险大；如果施氮１６８ｋｇ／ｈｍ２，可取得最大平均净收入，且无风险。害怕风险的农民可以在种植毛野豌豆时通过增施氮肥来提高净收入。种植冬小麦在任何施肥水平条件下都有较大的风险性。 By covering winter crops at different fertilization levels, the effects on net income and yield risk of zero-tillage maize were studied. No-tillage maize was planted in legumes with a high net income risk when N fertilizer was applied. Maximum nitrogen net income was obtained with 168 kg / hm2 of nitrogen applied, with no risk. Farmers who are scared of risk can raise their net income by adding nitrogen fertilizer when growing woolly peas. Planting winter wheat at any fertilization level has a greater risk.