摘要:
两熟在经济产量和生物产量上都明显地比一熟增产。春大豆—晚稻、春烤烟—晚稻和春大豆+春玉米—晚稻三种两熟制,可在水源条件较好,但光热条件不足,不适宜种植双季稻的稻田,因地制宜地推广。早稻—秋玉米两熟制,可在单季早稻的后作易旱地发展。凡是能种植双季稻的稻田,应相对地稳定播种面积,不要单纯追求经济效益。在人少地多、光热条件不足的地区,为了调节劳力,不违农时,可以保持一定的单季稻面积。在每熟作物均按特性要求施以中等水平的粪肥和化肥的情况下,两熟比一熟和水旱两熟比双季稻两熟的土壤肥力大都有所提高。
Abstract:
In comparison with single cropping, double cropping gave significant biomass and economic yields. Three kinds of double cropping, namely spring soybean-late rice, spring tobacco-late rice and soring soybeaa intercropping with corn-late rice, are recommended in fields well-irrigated but not suitable for the growth of double cropping rice owing to the limitation of solar energy.The double cropping of early riceautumn corn is suitable for fields where the crop after early rice is apt to suffer from drought. Fields for double cropping rice should be kept relatively stable in area so as to stablize rice production. Where the acreage per capta is somewhat larger and there is a limited supply of solar energy, maintaining single-cropping rice to some extent is still necessary, for the purpose of alleviating labour shortage and doing farm work in the right season. In general, soil fertility is somewhat higher after double cropping than after single cropping.And soil fertility is also somewhat higher after double cropping of rice and an upland crop than after doubling cropping of rice.
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