玉米青枯病的危害程度与密度、氮、磷关系的分析

Analysis on the relationship among the corn green withered disease and its density,nitropenous and phosphate fertilizer

本文采用二次回归通用旋转组合设计，研究了玉米青枯病的危害程度与播种密度（Ｘ１），施氮量（Ｘ２）和施磷量（Ｘ３）的关系，并组建了回归模型。结果表明，对玉米青枯病病指影响的首要因素是密度，其次是氮，对病指影响的交互效应是Ｘ１Ｘ２，Ｘ２Ｘ３。最后对模型进行模拟优化。

With the quadratic regress common rotational cmbination design, the relati-onship among the degree of thecorn's green withered disease and its sowing density,the nitrogenous fertilizer and phosphate fertilizer were studied and theregress model was built. The experiment result indicated that the main factor affecting the corn green withered disease isthe sowing density,then the nitrogenous fertilizer,whose alternate effect to the disease index is x1x2,x2x3. And at last thesimulated optimization was made to the model.