论文部分内容阅读
经调查测产,早稻纹枯病产量损失率与病情指数之间存在指数函数关系,拟合方程为:y=e0.4659+0.039 23x（式中y为损失率,x为病情指数）。根据望江地区情况,得出纹枯病经济允许损失L=2.17,防治指标用病情指数表示为8左右。
After investigation, the rate of yield loss of early rice sheath blight has an exponential relationship with disease index, and the fitting equation is: y = e0.4659 + 0.039 23x (where y is the loss rate and x is the disease index). According to the situation in Wangjiang, it was concluded that the economic allowable loss of sheath blight was L = 2.17, and the index of disease control was expressed as 8 with the disease index.