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在纬度、海拔较高、无霜期较短(105～120天)的地区和在麦收后需抢种一季玉米而热量条件又稍稍不足的地区(播种到收获仅90天),对极早熟玉米品种的要求比较迫切。这里以往种植的农家品种、杂交种,表现丰产性较差,生育期偏长,经济效益不理想。河北省承德地区农科所和河北乐亭县种子公司,针对本地生产的实际需要,经过多年的不懈努力,先后培育出适合本地区的极早熟玉米杂交种:冀承单3号和唐
In areas with high latitudes and altitudes, short frost-free periods (105-120 days) and areas where wheat is required to plant a first season of corn with slightly lower heat conditions (sowing to harvest for only 90 days), the requirement for very early maize varieties More urgent. Here in the past the cultivation of farm breeds, hybrids, poor performance of poor yield, long growth period, the economic benefits are not ideal. Agricultural Science Institute of Chengde in Hebei Province and Hebei Laoting County Seed Company, in response to the actual needs of local production, after years of unremitting efforts, has developed a very early maturity for the region of maize hybrids: Ji Cheng Dan 3 and Tang