本文根据1988年在浙江省红壤性水稻土冬作大麦多点田间试验得到的百分产量与MedlichⅢ—P相关资料,系统地介绍最先由Cate和Nelson提出的把土壤测定与作物反应概率划分成二级的图解法和方差分析法.指出方差分析法优于图解法.在两组相关资料中,该法得到的R~2值与其它六种模式的R~2相仿或略高. Based on the data of percentage yield and MedlichⅢ-P obtained from the field trials of winter wheat barley with red soil in Zhejiang Province in 1988, this paper systematically introduces the classification of soil determination and crop response probability Second-level graphical method and analysis of variance method, pointing out that ANOVA method is superior to the graphic method.In the two groups of related data, the R ~ 2 value obtained by this method is similar or slightly higher than R ~ 2 of the other six kinds of patterns.