摘要
采取二次通用旋转设计及病虫2因素7水平全因子试验,研究不同肥密水平及相同条件下纹枯病(A)、第二代二化螟(B)的复合为害损失(AB)。结果表明,对水稻产量的影响,A、B、A×B均达极显著水准,证明病虫存在复合为害关系;复合为害的总损失与肥密因子有关,但受害株的损失与此无关。其损失率大小依次为:A<B<AB<A+B。根据AIC最小准则选择并组建了复合为害损失及复合经济阈值模型。经两年田间小区、大区、大面积应用检验,符合率达85%以上。
In 1987—1989,the mixed damage of rice sheath blight Pellicularia
sasakii(A)and second generation rice stem borer Chilo suppressalis(B)
was studies in Qionglai and Guanghan Counties,Sichuan Province,
under normal cultivation and different levels of nitrogen,potassium and
plant densities by applying complete blocking and general quadratic
rotation designs.The results showed that there were hightly signifi-
cant damage of A,B,and AB to loss of rice yield.The total yield loss
of mixed damage,but not the yield loss of damaged plants,had rela-
tion to the fertilizer and density factors.Based on the princile of
minimum AIC criterion,some simulalated models of mixed damage and
economic thresholds were developed,which were 85% approximately
adaptable to field reality through a series of acceptance tests and
demonstrations in two years.
出处
《植物保护学报》
CAS
CSCD
北大核心
1991年第3期241-246,共6页
Journal of Plant Protection
关键词
水稻
纹枯病
二化螟
经济阈值
rice
Pellicularia sasakii
Chilo suppressalis
mixed economic threshold
