摘要
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。
Severity and yield loss of rice sheath blight (P. sasakii) were studied under different conditions of applications of N, K fertilizers and planting densities during 1987-1989. Results showed that the nonlinear regressive relationships of the disease severity and total yield loss among the three experimental factors were significant (p<0.01),but the yield lost from infected plants was not significantly related to any of the factors howeven was correlated with the disease index values as the following formula: Y=0.0746+2.3334X (p<0.01; X=l,3,5,7,9)
Moreover, effect of the factors on rice yield protected by chemicals is also discussed.
出处
《植物病理学报》
CAS
CSCD
北大核心
1991年第4期305-309,共5页
Acta Phytopathologica Sinica
