河西地区位于甘肃省西部,是典型的大陆性气候,年平均气温7～8℃,降水量60～610mm,蒸发量1400～3010mm,日照时数2200～3030h,无霜期85～165d[1]。其生产的种子子粒饱满,光泽度好,千粒重高,商品性优。目前已是全国最大的玉米种子生产基地之一,常年制种面积达6万～7万hm2,年产种子占全国玉米用种量的45%以上。近年来,由于气候异常,玉米制种花期常遭受高温干旱、阴雨等不良气候的影响,造成空秆、缺 The Hexi area is located in the western part of Gansu Province. It is a typical continental climate with annual average temperature of 7-8 ℃, precipitation of 60-610mm, evaporation of 1400-3010mm, sunshine hours of 2200-3030h and frost-free period of 85-165d. The seeds produced by its full seeds, gloss, grain weight high, excellent product. At present, it is one of the largest maize seed production bases in the country. Its annual perennial seed production area is 60,000 to 70,000 hm2, and the annual output of seeds occupies more than 45% of the total maize species. In recent years, due to the anomalous climate, the flowering season of maize is often affected by the adverse weather such as high temperature and drought, rainy weather and the like, resulting in empty stalk, lack of