遵照毛主席“以粮为纲,全面发展”的方针,以间作套种、提高复种指数为中心的耕种制度改革在华北平原棉麦产区已初步展开,使单位面积产量得到较大幅度的提高,促进了农业生产的发展。在土、肥、水条件逐步改善的基础上,实行棉麦套种对于促进粮棉增产具有 In line with Chairman Mao’s principle of “taking grain as the key link and all-round development”, the reform of the farming system centered on inter-cropping and raising the multiple cropping index has been carried out tentatively in cotton and wheat producing areas in the North China Plain, resulting in a substantial increase in output per unit area, Promote the development of agricultural production. On the basis of gradual improvement of soil, fertilizer and water conditions, the implementation of cotton-wheat intercropping has the following advantages