应用二次正交旋转组合设计方法建立粽管巢蛛和拟水狼蛛对稻纵卷叶螟和稻褐飞虱捕食作用的数学模型。
The quadratic orthogonal rotation design with five factors was used to study the effect of of technology for production of biodiesel.
文摘：研究了江淮稻区白背飞虱和褐飞虱的成灾规律，以及稻飞虱灾变的短、期预测技术。
Abstract: The disastrous rule of rice planthopper occurrence in Jianghuai rice region and its forecast techniques were studied.
褐飞虱在中国分布很广，近年来已成为南方稻区的主要害虫。
Brown plant hopper distributes very wide, and it has been the major rice insects in Southern China.
研究了江淮稻区白背飞虱和褐飞虱的成灾规律，以及稻飞虱灾变的短、期预测技术。
The disastrous rule of rice planthopper occurrence in Jianghuai rice region and its forecast techniques were studied.
1990年以后，以前表现抗虫的杂交稻变得高感褐飞虱。
After 1990, previously BPH-resistant hybrid rice became highly susceptible to BPH.
1990年以后，以前表现抗虫的杂交稻变得高感褐飞虱。
After 1990, previously BPH-resistant hybrid rice became highly susceptible to BPH.
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