本试验目的是研究多效唑不同时期、不同剂型、不同施用方法对中稻(杂交稻)防倒增产的效果,为大面积推广应用多效唑提供依据。 材料和方法 1984年,试验在兴化县农科所进行,品种为南京11号,亩施纯氮10.5公斤,小区面积10平方米。1985、1986年试验在兴化县农技中心进行,品种分别为汕优63号、34-21,亩施纯氮分别为19.7、14.7公斤,小区面积 The purpose of this experiment is to study the effect of paclobutrazol on the anti-down and yield increase of mid-rice (hybrid rice) in different periods, different dosage forms and different application methods, and provide the basis for promoting and using paclobutrazol in a large area. Materials and Methods In 1984, the experiment was carried out in Xinghua County Agricultural Science Institute, with varieties of Nanjing No. 11, Mushi’s pure nitrogen of 10.5 kg and the plot area of ​​10 square meters. 1985, 1986 experiments in Xinghua County Agricultural Technology Center, the varieties were Shanyou 63, 34-21, Mushi nitrogen were 19.7,14.7 kg, the plot area