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河北省东北部,常年无霜期180天左右,热量资源两季不足、一季有余,基本上属于一年一熟耕作区。七十年代兴起的带田套种的种植形式,为充分利用光热资源、提高粮食产量,起到了重要作用。1982年以后、随着承包责任制的落实,一些农户为进一步提高经济效益,将小麦套种玉米改为玉米蔬菜连作,既保了粮,又得了菜,经济效益显著提高,因而普及很快。仅据抚宁县留守营区四个乡的统计,1987年玉米蔬菜连作面积已发展到9000余亩,占玉米播种面积的四分之一。
Northeast Hebei Province, perennial frost-free period of about 180 days, less than two quarters of heat resources, more than a quarter, basically belongs to a farming area one year. The planting patterns of cropland intercropping in the seventies have played an important role in making full use of light and heat resources and increasing grain output. Since 1982, with the implementation of the contract responsibility system, some farmers have popularized the use of wheat intercropped with corn and vegetables in order to further improve economic efficiency. They not only secured food but also obtained food and significantly increased their economic benefits. According to the statistics of the four townships left in the camps in Funing County, the area of continuous cropping of corn and vegetables in 1987 has grown to more than 9,000 mu, accounting for one quarter of the corn sown area.