药剂防治大豆灰斑病的效果与效益研究

Study on The Effects and Benefits in The Process of Controlling Cercospora sojina Hara by Fungicide

在大豆生长的不同时期,采用不同的杀菌剂,对药剂防治大豆灰斑病的效果与效益进行了研究。结果表明药剂防治大豆灰斑病的关键时期是在大豆开花到结荚和鼓粒初期,过迟施药防病效果下降。用YPB=Y(1-YPSi)×(1+YPTj)×(1+YPKl)模型可预测产量总防效;用SPB=Y′(1-SPSi)×(1+SPTj)×(1+SPKl)模型可预测病粒率总防效;用PEB=YPM×(1+YPB)×PWn-YPM×PW′n模型可预测药剂防治总效益。模型经在八五五农场大面积运行,获得很好的经济效益。

By choosing several different fungicides to control cercospora sojina Hara at different growth periods of soybean, the effects and benefits in this process were investigated in this thesis. The results showed the optimum time for controlling cercospora sojina Hara by fungicide was from the flowering time to the podding and seeding time. And the control effect will fall down if the fungicide is employed too late. The model YPB=Y （1-YPSj）×（1＋YPTj）×（1＋YPKl） can be used in forecasting the control effect of yield, the model SPB=Y′（1-SPSi）×（1＋SPTj）×（1＋SPKL） can be used in forecasting the control effect of disease seeds, and the model PEB=YPM×（1＋YPB）×PWn-YPM×PW＇n can be used in forecasting the total control effect of fungicide. The models have been confirmed resultful by using them in production.