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上海郊区五十年代实行稻一麦(绿肥、油菜籽)两熟制。在改良品种、兴修水利和增施化肥的基础上,1965年前后,开始普遍推行麦(绿肥、油菜籽)—稻—稻粮食三熟制,复种指数从原来的160%左右提高到247%左右,年产量从平均千斤左右提高到目前的1500—1600斤/亩,随着土地利用率
Shanghai suburbs in the 1950s to implement rice a wheat (green manure, rapeseed) two cooked. On the basis of improved variety, water conservation and fertilizer application, wheat (green manure, rapeseed) - rice-rice grain three-cropping system began to prevail around 1965, and the multiple crop index increased from about 160% to about 247% , Annual output increased from about an average of about 1000-1600 pounds kg / mu, with the land utilization rate