苏南地区自然条件优越,水热条件较好。科学种田不断提高,促进了耕作制度的改革,由原来的一年两熟和两年三熟逐步改变为一年三熟。在五十年代末,六十年代初,奔牛、吕城两地群众,创造了二旱一水的麦、豆、稻轮作制,在六十年代中,相继在丹阳、武进、丹徒、金坛、江阴等地扩种推广,深受群众欢迎。七十年代由于“四人邦”干扰,长官意志的作风,不考虑不同自然环境和人力、肥料等条件,一概扩大双季稻, Excellent natural conditions in southern Jiangsu, hydrothermal conditions are better. Scientific farming continues to increase, promoting the reform of the farming system, changing from two crops a year and two crops a year to three crops a year. In the late 1950s and early 1960s, the people in both Benniu and Lucheng provinces created a series of crops such as wheat, beans and rice for rotation and drought. In the 1960s, Jintan, Jiangyin and other places to expand the promotion, welcomed by the masses. In the seventies, due to the interference of the “gang of four” and the style of the executive’s will, irrespective of the conditions of different natural environments and manpower and manure and fertilizer, the double crop of rice,