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自1977年从辽宁引入粳稻杂交组合黎明 A×C_(57)、丰锦 A×C_(57)在北京郊区连续试种三年,均获得成功。1979年试种10400亩,一般增产20～30%。1979年北京市郊区气温较低,但杂交稻仍显著增产。据对69个点5660亩统计,杂交稻平均亩产839.9斤,对照平均为604.1斤,每亩增产235.8斤,增产幅度39%。黎明 A×C_(57)在北京郊区生育期145天,可做冬小麦下茬,5月中旬播种,6月下旬
Dawn A × C_ (57), Fengjin A × C_ (57), a japonica hybrid combination introduced from Liaoning Province in 1977, were successfully tested in the suburbs of Beijing for three years. Trial planting 10400 acres in 1979, the general increase of 20 to 30%. In 1979, the temperature in the suburbs of Beijing was lower, but hybrid rice still increased significantly. According to the statistics of 56 points of 69 spots, the average yield of hybrid rice is 839.9 kg, the control average is 604.1 kg, 235.8 kg per acre, and the increase rate is 39%. Dawn A × C_ (57) in the suburbs of Beijing, the growth period of 145 days, winter wheat can be done under the crop, mid-May sowing, late June