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采用五因素 (1 2实施 )二次正交旋转组合设计方法 ,在田间实施氮肥、磷肥、钾肥、密度和氮肥施用期对水稻纹枯病病情指数的影响进行了研究 ,并建立了病情指数 (Y)与几个因素的回归方程 ,回归方程为Y =12 .370 91- 1.6 6 75X2 - 1.716 2 5X1X3 。结果表明 ,氮肥、磷肥和钾肥对纹枯病的病情指数影响大 ,而穗肥施用期和密度对纹枯病的病情指数影响不大 ;不同因素间存在交互作用 ,对纹枯病影响最大的是氮肥与钾肥之间的相互作用
The effects of nitrogen, phosphate, potash fertilizer, density and nitrogen fertilizer application period on the disease index of rice sheath blight were studied using a five-factor (12) quadratic orthogonal rotation combination design method. The disease index Y) and the regression equation of several factors, the regression equation is Y = 12.370 91-1.6 6 75X2-1.716 2 5X1X3. The results showed that nitrogen, phosphate and potassium fertilizers had a great effect on the disease index of sheath blight, while the application period and density of panicle fertilization had little effect on the disease index of sheath blight. The interaction between different factors had the greatest effect on sheath blight Is the interaction between nitrogen and potassium fertilizer