摘要
目前国内研究的和生产中应用的农作物病害的防治指标都不具有动态特点。防治指标的动态性包括时间动态和空间动态。本文建立的水稻纹枯病经济阈值模型为: f(x_2)-f(x_3)=C×F/(Y×P×E) x_2/(1-x_2)=[x_1/(1-x_1)]×e^(r.t) E=1-(x_3-x_1)/(x_2-x_1) f(x)=1-exp{-[(x-a)/b]~c} 该模型能计算出水稻不同生长阶段(时间)、不同种植区域或不同年际间(空间)的稻纹枯病防治指标。
The control thresholds of crop diseases which are currently studied and even used in practices are non-dynamically characterized, A new dynamic economic thresholds model of rice sheath blight associated with time and space was established as follows: f(x2)-f(x3) = C×F / (Y×P×E) x2/(1-x2) = [(x1/(1-x1)]×ert E=1-(x3-x1)/(x2-x1)
f(x)=1-exp{-[(x-a)/b]0} The control thresholds of rice sheath blight on different stages of rice (time) and different
grown areas or years (space) can be determined with this model.
出处
《江西农业学报》
CAS
1990年第1期63-69,共7页
Acta Agriculturae Jiangxi
关键词
经济阈值
水稻纹枯病
病害
纹枯病
防治
Dynamic, Economic threshold, Loss assessment, Rice sheath blight.
