本文研究了播期、密度和氮肥对小麦白粉病及产量的定量效应,组建了病情指数及产量回归数学模型,并对其进行了检验和解析,结果表明:两回归模型均在0.01水平上显著,且拟合较好;三个因子对白粉病病指的影响为:播期>氮肥>密度,对产量的影响为:播期>密度>氮肥;播期与氮肥互作对病指的影响达到0.05显著水平,播期与密度互作对病指及产量的影响分别在0.1和0.05水平上显著;早播稀植低氮措施组合有利于控制小麦白粉病,减少产量损失。最后对回归模型进行了仿真优化,提出了控病增产的栽培措施决策方案。 In this paper, the quantitative effects of sowing date, density and nitrogen fertilizer on wheat powdery mildew and yield were studied. The mathematical model of disease index and yield regression was established and tested and analyzed. The results showed that both regression models were significant at 0.01 level The effect of three factors on the disease index of powdery mildew was: sowing date> nitrogen fertilizer> density, and the effect on yield was sowing date> density> nitrogen fertilizer; the effect of sowing date and nitrogen fertilizer on disease index reached 0.05 significant level, sowing date and density interaction on the index finger and yield were significant at the level of 0.1 and 0.05 respectively; combination of early sowing planted low nitrogen is conducive to control wheat powdery mildew and reduce the yield loss. Finally, the regression model was simulated and optimized, and the plan of cultivation measures for disease control and yield increase was put forward.