摘要
通过田间小区接菌试验及统计分析表明:棉花黄萎病始花期的病情指数与棉花产量损失的相关性最强。在一定范围内种植密度愈高,群体间的补偿作用愈显著,适当密植是弥补损失的一项措施。还表明生病主要通过减少单株结铃数影响产量,绒长亦受到影响,而对单铃重、衣分影响不火。用多元回归法选取始花期病指(X_2)与密度(X_4),建立的产量损失预测式为: L=1-exp[-exp(1.028LnX_2-0.000157X_4+0.9967)],r=0.8643,S_(LX)=0.079。
Based on field inoculation experiment and statistical analysis from 1983 to 1985, the highest value of R is found between yield loss of cotton anddisease index at the beginning of flowering (X_2).When plants are denser yield loss can be reduced, because the denser the planting in a field plot the stronger the compensation when the density of crop is from 3500 to 6500/mu. Cotton yieldis decreased by the major reason that the total number of cotton bolls is decreased through verticilium wilt. With respect to the weight of a single boll and gin turnout, there is no clear difference between healthy and diseaed field plots. According to multiple regreession analysis a model for yield loss of verticilium wilt has been developed with the inclusion of disease indes(x_3) and crop sensity (x_4).
It is: L=1-exp [-exp (1.028 LnX_2-0.000157X_4+0.9967)]
r=0.8643 S_(LX)=0,079
出处
《植物病理学报》
CAS
CSCD
北大核心
1990年第1期73-78,共6页
Acta Phytopathologica Sinica
