秋播小麦由于年前气温偏高,早播田的麦苗生长锥,年前开始穗分化,特别是七五年和七七年,年前积温偏高,一般地力上,九月十三日以前播种的麦田,主茎大部分进入单稜期,个别肥地和弱冬性品种也有进入二稜期的。九月十五日左右播种的生长锥普遍开始伸长。这些麦苗抗寒性和抗旱性都显著减弱。经过一冬风吹、冷冻、土壤表层干土层达3—5厘米,分蘖节处于干土层内, Autumn wheat sowing Since the year ago, the temperature is too high, early sowing wheat seedling growth cone, spike differentiation began years ago, especially in 1975 and 1977, years ago, high temperature, generally on the soil, September 13 before sowing Of the wheat fields, most of the main stem into the single-ridge period, individual fertilizer and weak winter varieties have entered the two-ridge period. Growing cones sown around September 15 generally began to lengthen. Cold and drought resistance of these barley significantly reduced. After a winter wind blowing, freezing, soil surface dry soil layer 3-5 cm, tillering section in dry soil layer,