我国在上世纪70年代末在一些产棉重点省区陆续推广了杂交棉,杂交棉比当地的常规棉一般增产10%左右。当时的杂交棉品种,平均植株高度100厘米左右,每667平方米密度3000株左右,整枝频繁,果枝16～18层,单株成桃18～20个,单铃重5克左右,667平方米产皮棉90千克左右。近几年来,随着棉 In the late 1970s, China popularized hybrid cotton in key cotton-producing provinces and autonomous regions. Hybrid cotton generally increased about 10% of that of conventional cotton. At the time of hybrid cotton varieties, the average plant height of about 100 cm, density of about 6600 per 667 square meters, frequent pruning, fruiting branches of 16 to 18 layers, individual peach 18 to 20, boll weight 5 grams, 667 square meters Lint-producing 90 kg or so. In recent years, with the cotton