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长江三角洲植棉已有七、八百年历史,其棉区农作制的演变可划分为三个时期: (一) 十七世纪初,棉区已采取稻棉轮作、冬季休闲或种绿肥,人口较密的地区则为棉麦两熟,此时棉麦套种尚处于萌芽阶段; (二) 十七世纪前期到新中国成立的三百多年中,由于人口增加,一年一熟的棉田渐渐减少,棉麦两熟的越来越多; (三) 新中国成立后,为了充分利用土地,棉粮兼顾,因此棉区的农作制有下列一些转变:1.稻棉轮作区原来以植棉为主,现在水稻渐占较重要地位。2.旱粮棉区的棉农创造了多种棉花和粮食作物的间作套种方式。3.1965年起,有些地方以玉米与棉花间作,但对棉花生长发育不利。
Cotton plants in the Yangtze River Delta have been cultivated for seven or eight hundred years. The evolution of their cotton farming system can be divided into three periods: (1) At the beginning of the seventeenth century, cotton paddy crop rotation, winter recreation or green manure, In densely populated areas, there is cotton and wheat two crops at a time when cotton and wheat intercropping is still in its infancy; (b) During the early seventeenth century to the founding of New China for more than 300 years, due to the increase of population, (C) After the founding of new China, in order to make full use of land and grain and grain, the following changes have taken place in the cropping system in the cotton area: Cotton-based, now gradually occupy an important position in rice. 2. Farmers in the dryland cotton area have created intercropping practices for a variety of cotton and food crops. 3. From 1965 onwards, corn and cotton have been used in some places, but they are unfavorable to the growth and development of cotton.