The sensitive index obtained by least - squared method sometimes can not be scientifically explained in terms of crop physiology . the phenomenon is related to the statistical distribution of experiment data in addition to the number of experiment treatment and water deficit level 受最小二乘法求优数学解的约束,在求解作物水分响应模型的敏感指标时常出现从作物生理和物理上难以科学解释的情况,这除与试验处理数量多少及缺水水平有关外,也与试验数据的统计分布有关。