８０年代以来，黄淮海平原麦棉两熟制发展很快，目前麦套棉花已占棉田面积的６０％。但该区套种棉花一般迟发晚熟１５天，小麦晚播１５～２０天，一定程度上制约了周年全田持续生产，植棉比较效益下降，尤其近年来，灾害性天气较多，棉花大幅度减产，霜前花率低，严重影响... Since the 1980s, the double cropping system of wheat and cotton in the Huang-Huai-Hai Plain has developed rapidly. At present, 60% of cotton area has been occupied by wheat-cotton. However, the late cotton late maturing 15 days and wheat late sowing 15 to 20 days in the intercropping cotton generally restricted the continuous production in the whole year and reduced the comparative benefits of cotton planting. In particular, in recent years, there are more catastrophic weather, Reduce production, pre-frost rate is low, seriously affected ...