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采用二次正交旋转组合设计方法，研究了降水的季节分布对春小麦产量的影响，建立了数学模型；分析了因素的主次，６月降水对小麦产量影响最大；提出了丰产的降水分布为４月２３．８～３２．３ｍｍ，５月５０．６～５８．７ｍｍ，６月９４．７～１０３ｍｍ，７月１６１．２～１７２．８ｍｍ；分析了边际产量效应，各月均是在干旱时灌水边际产量效应高，超过适宜水分后为负效应。为合理利用气候资源和节水灌既提供科学依据。模型也可用于省内地区降水对小麦产量影响的测报
The quadratic orthogonal rotation combination design method was used to study the effect of seasonal distribution of precipitation on the yield of spring wheat. The mathematical model was established. The primary and secondary factors were analyzed. The precipitation in June had the greatest impact on the yield of wheat. The precipitation distribution with high yield was April 23.8 ~ 32.3mm, May 50.6 ~ 58.7mm, June 94.7 ~ 103mm, July 161.2 ~ 172.8mm; analyzed the marginal yield effect, each month is in the drought When irrigation marginal yield effect is high, more than the appropriate water after the negative effect. To provide scientific basis for rational use of climate resources and water-saving irrigation. The model can also be used to measure the impact of precipitation on wheat yield in the province