豫南小麦种植区位于华北平原中熟东麦区的南部边沿,近年来,豫南由于冬季气温偏高,冬暖现象明显,小麦越冬生长不停形成旺长,有些年份一旦遇有寒流,形成冻害;4-5月份气流回升加快,尤其小麦灌浆中后期常遇干热风等灾害性天气危害,造成小麦减产;同时,冬小麦生育又具有“分蘖期长、? In southern Henan Province, the wheat planting area is located on the southern edge of Zhongmai Dongmai area in the North China Plain. In recent years, due to the high winter temperatures and the warm winters, the phenomenon of winter warm in the south of Henan Province is obvious. The winter wheat growth continues to flourish. In some years, Frost damage; April-May air flow picked up faster, especially in the late wheat filling often dry and hot wind and other disastrous weather hazards, resulting in wheat yield; the same time, winter wheat has a "tillering period?