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北京地区在我国两熟制区所占的面积较小,但粮食生产的地位在农村工作中却很重要.建国以来,为了持续稳定增加粮食产量,充分利用京郊农业气候资源,在种植制度方面几经变革.如50年代就开始了小麦、玉米大垅套;60年代实施了“小对垅”、“三密一稀”的耕作栽培技术;70年代推广了“三种三收”种植
However, the status of grain production in rural areas is very important. Since the founding of the People’s Republic of China, in order to sustainably increase grain output and make full use of agricultural climate resources in the suburbs of Beijing, After several revolutions, such as the beginning of the 1950s, wheat and maize sets were introduced. In the 1960s, the cultivation techniques of “Xiaoganjian” and “Sanmiichi” were implemented; in the 1970s, the “three kinds of three harvests” were promoted