一、粮棉套种发展现状无产阶级文化大革命以来,北方棉区随着农田基本建设的发展,水肥条件的改变以及适应夏粮扩大生产的需要,棉田改制即棉花由一年一熟改为以小麦为主的粮棉套种两熟发展较快。据初步统计,河北、河南、山东、山西、陕西、北京等六个省、市,粮棉 I. Development Situation of Grain and Cotton Intercropping Since the Great Proletarian Cultural Revolution, with the development of farmland infrastructures, the change of water and fertilizer conditions and the need of expanding the production of summer grains in the northern cotton area, the transformation of cotton fields is changed from one ripening to one growing of wheat The main varieties of cotton intercropping developed rapidly. According to preliminary statistics, Hebei, Henan, Shandong, Shanxi, Shaanxi, Beijing and other six provinces, cities, grain and cotton