1979—1980年度我区小麦越冬期间发生了较严重的冻害,冻害面积56万亩,占麦田总面积的16%。冻害轻的缺苗10—20%,重的缺苗30%以上。由于冻害造成群体较小,个体发育弱,单株分蘖少,成穗率低。高产田的亩穗数较上年少3—5万穗,中低产田少5—10万穗。受冻地块每亩减产70—150斤。本年度的气候特点是冬来早、冬季冷暖反常。据泰安气象站观测,11月上旬气温较常年偏高3—4℃,而中旬气温突降10℃以上,最低温度达-14℃,当时正值我区小麦分蘖期,麦苗又缺乏晚秋低温锻炼,因 During the period of 1979-1980, more serious frost damage occurred during winter in our area. The frost damage area was 56 million mu, accounting for 16% of the total area of ​​the wheat field. Frozen light lack of seedlings 10-20%, heavy seedlings more than 30%. As a result of frost damage caused by smaller groups, individual development is weak, fewer tillers per plant, into a low ear rate. The number of high-yielding fields per acre less than the previous year 3-5 million spike, 5-10 million low-yield fields less spikes. Frozen plots cut 70-150 pounds per mu. This year’s climate is characterized by winter and early winter, winter anomalies. According to the observation of Tai’an weather station, the temperature in early November was 3-4 ℃ higher than that in normal years, while the temperature in the middle dropped suddenly by 10 ℃ and the lowest temperature reached -14 ℃. At that time, it was at the tillering stage of wheat in our region, ,because