应用回归旋转设计法研究红壤水田三熟制油菜氮磷钾肥合理施用量涂运昌，谢立华，李金树（中国农业科学院油料作物研究所，武昌４３００６２）在单因素试验基础上，提出多因素试验是生产力发展的必然结果。研究油菜氮磷钾肥配施条件下的合理施用量，采用定性的试验方法已不... Applying Regression Rotation Design Method to Study Rational Application Rate of Nitrogen, Phosphorus and Potassium Fertilizer in Red Paddy Paddy Field Tu Yunchang, Xie Lihua, Li Jinshu (Institute of Oil Crops, Chinese Academy of Agricultural Sciences, Wuchang 430062) Based on the single factor experiment, it is proposed that the multifactorial experiment is the development of productive forces The inevitable result. Study rape nitrogen, phosphorus and potassium fertilizers under the conditions of the rational application rate, the use of qualitative test method has not ...