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安庆沿江中下游棉区,棉花与麦子、蚕豆等午季粮食作物两熟栽培,具有悠久历史。这种粮棉两熟制約占棉田面积的45—80%,在今后相当长的时期内还占有重要的地位。粮棉两熟,由于复种面积增加,棉花和麦、豆生长期又长,約一百七十至二百一十天,因此,在适期播种、耕作管理、劳力、肥料以及二者群体生长好歹上,必然存在一定的矛盾。以麦、棉两熟来說,一般棉花拔稭后(11月中旬)播种小麦有嫌过迟,冬季分蘖少,成熟晚,容易感染銹病而減产;棉花5月底、6月初接茬播种,通常因生育期縮短,发育不健全,結鈴少,产量低;如果套种,播种前不能精耕細作,特别是麦类播种方法不当、后期生长过旺,易使棉苗蔭蔽加剧,
Anqing along the middle and lower reaches of the cotton area, cotton and wheat, broad bean and other mid-season food crop cultivation, has a long history. This grain and cotton double crop control accounts for 45-80% of the total area of the cotton field and occupies an important position for quite a long time in the future. Because of the double cropping of cotton and wheat, the growing period of cotton and wheat and beans is about 170 to 210 days. Therefore, in proper seeding, cultivation management, labor, fertilizer and the growth of both groups Anyhow, there must be some contradictions. To wheat, cotton two cooked, the general cotton after straw (mid November) sowing too late in winter, less tillering, late maturity, susceptible to rust and reduce production; cotton at the end of May, early June seeding crop, usually Due to shortened growth period, poor development, less bolls, low yield; if the intercropping, planting can not be intensive before sowing, especially improper sowing methods of wheat, the late growth over the prosperous, easy to make cotton seedling shading exacerbated,