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上海郊区从六十年代改制以来,长期以双三制作为主要耕作制度,其特点是复种指数高,用肥量高,化工多,产量高而不稳。随着经济体制改革的发展,农村劳力大量流向乡镇办工副业。对于缓解农村劳力紧张的状况,除了恢复二熟制(单晚——三麦等)以外,可采用简易施肥技术。目前上海郊区单季晚稻的种植面积约为250万亩左右,约占水稻总面积的80％。对于单季晚稻的施肥和栽培技术,我国在五十年代曾作过广泛研究,陈永康倡导的“三黄三黑”施肥方法,施肥次数多,化工大等。在国
Since its establishment in the 1960s, the suburb of Shanghai has long been using Shuangsan system as its main farming system. Its characteristics are high multiple crop index, high fertilizer use rate, large chemical industry and high and unstable output. With the development of economic system reform, a large number of rural labors flow to township and town sideline and sideline businesses. For the alleviation of the situation of rural labor shortage, in addition to the restoration of second-cooked (single night - three wheat, etc.) outside, the simple fertilization technology can be used. At present, the planting area of single-season late rice in the suburbs of Shanghai is about 2.5 million mu, accounting for about 80% of the total rice area. For the single season late rice fertilization and cultivation techniques, China made extensive research in the fifties, Chen Yongkang advocated “three yellow and black” fertilization methods, fertilization frequency, chemical industry and so on. In the country