论文部分内容阅读
采用二次回归通用旋转组合设计,研究了水稻纹枯病的危害程度、产量损失与亩施氮量、施钾量和水稻移栽密度的关系。结果表明:水稻成熟期纹枯病病指、总产量损失与氮、钾、密因素存在极显著的非线性关系(p<0.01),但病株的产量损失与这些因素的关系不明显(p>0.05),与病情严重度分级的关系极显著,且:y=0.0746+2.333 4x(p<0.01)。此外,本文还对水稻在几乎不受病虫危害时的产量水平,受纹枯病危害后的产量损失与试验因素间的关系,进行了分析。
The quadratic regression general rotation combination design was used to study the damage degree of rice sheath blight, the relationship between yield loss and the amount of N application, K application and transplanting density. The results showed that there was a significant non-linear relationship between pathogen index and total yield loss of rice sheath blight and nitrogen, potassium and mildew factors (p <0.01), but the yield loss of the diseased plant had no significant relationship with these factors (p > 0.05), and the relationship between the grading of disease severity was significant, and: y = 0.0746 + 2.333 4x (p <0.01). In addition, the paper also analyzed the relationship between yield and yield of rice after it was almost insensitive to pests and diseases, the yield loss caused by sheath blight, and the experimental factors.