1994～ 1995年 ,在冀西北高原进行了夏播小麦品种引选试验。结果表明 ,用于夏播的春型强春性品种 5月下旬播种 ,8月底至 9月初能正常成熟。它们的主茎只有 6～ 7片叶。生育早期无低温要求 ,不存在田间春化期 ,对日长的生态适应性较强 ,较高的温度促进了生育进程。在播种—拔节、拔节—抽穗、抽穗—成熟三个生育阶段中 ,表现“短—短—长”特征。植株生长发育过程中的需水节律与自然降水节律大体一致。高纬度、高海拔一熟制冷凉地区夏播小麦具有较高的产量水平和较大的增产潜力 During 1994-1995, the introduction of summer sowing wheat varieties was conducted in Northwest Hebei Plateau. The results showed that the spring type spring spring sowing varieties for summer sowing were sown in late May and the end of August to the beginning of September were able to mature normally. Their main stem only 6 to 7 leaves. There is no requirement for low temperature during early growth, there is no field vernalization, strong ecological adaptability to Japan, and higher temperature promotes the process of fertility. In sowing - jointing, jointing - heading, heading - mature three stages of growth, the performance of “short - short - long” characteristics. The rhythm of water demand during plant growth and development is roughly the same as the natural precipitation rhythm. Summer sowing of high-latitude and high-altitude, single-cropping and cool area has higher yield and larger yield potential