本文通过对大面积冬小麦产量和气象因子关系的分析,得到中产水平小麦各生育期降水和温度的最适指标和大幅度减产的临界指标,这些指际对栽培、耕怍和区划工作是有用的.一、材料与方法用相邻的许昌、西华、太康和郾城四县各20年共80年的亩产和气象因子进行统计分析. Through the analysis of the relationship between the yield of large-area winter wheat and meteorological factors, the optimum index of precipitation and temperature in each growing stage of middle-yield wheat and the critical index of large-scale yield reduction are obtained, which are useful for cultivation, cultivation and zoning I.Materials and Methods Statistical analysis was made on the yield and meteorological factors of 80 mu in each of the 20 adjacent years in Xuchang, Xihua, Taikang and Tancheng Counties.