摘要
在田间人工接种条件下,比较江苏省10个水稻生产品种的纹枯病发病程度及其产量损失率。结果表明:水稻品种间的发病程度和产量损失率均有明显差异。增施氮肥后纹枯病的严重度增加,但对产量的影响则因品种而异。在按株测定7个水稻生产品种的病害严重度与产量损失的关系中获知:用来衡量病害严重度的病级(病斑高度)与产量损失之间有十分密切的关系,从而建立了病级(x)与产量损失率(y)之间的回归方程:y=4.487x-1.416。
Ten rice cultivars were tested under field conditions in Jiangsu province for susceptibility tosheath blight and for the yield loss by artificial inoculation.The results showed that both suscep-tibility and yield loss were obviously different among tested cultivars.The disease severity wasincreased with the increasing application of nitrogenous fertilizer,hut its influence on yield losswas varied with cultivars. After analysing the relationship between disease severity and yield loss of 7 rice cultivars,it shows there exists a close positive relationship between disease index (height of lesion devel-opment) and yield loss.A regression equation is established as following: y=4.487x-1.416 where y is yield loss and x is disease index.
出处
《植物保护学报》
CAS
CSCD
北大核心
1989年第1期49-54,共6页
Journal of Plant Protection
