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1986年3月初,我省小麦多数处于孕穗阶段,少数已抽穗扬花,麦粒生长喜人。但由于3月1～5日遭受了自1928年以来从未出现过的严重冻害,造成山地麦、田麦产量大减,严重的颗粒无收。据调查,小麦受冻害轻重与发育早迟有关。小麦在拨节后,耐寒性逐渐降低,特别是孕穗期后易受冻害。如在黑龙潭宝云乡调查10株“4283”品种,在未灌水的条件下,其主茎受冻率为60％、分蘖受冻率为85.5％;在省农科院调查,于灌水条件下主茎受冻率70％,分蘖均未受冻。说明主茎复数处于孕穗期后,灌水与不灌水均无多大差异,而灌水对发育期稍晚的分蘖增加抗寒性有明显效果。
Early March 1986, the majority of wheat in our province at the booting stage, a few have heading and flowering, gratifying growth of wheat. However, due to severe freeze damage that had never occurred since 1928 from March 1 to March 5, the yield of wheat and field wheat in the mountain areas was greatly reduced, and serious particles were lost. According to the survey, the severity of frost damage by wheat is related to the early stage of development. After dialing in wheat, cold resistance gradually decreased, especially after the booting stage vulnerable to frost damage. For example, the investigation of 10 “4283” cultivars in Baoyun Township, Heilongtan, under the condition of no irrigation, the main stems’ freezing rate was 60% and the tillering rate was 85.5%; at the provincial Academy of Agricultural Sciences, Under the main stem by the freezing rate of 70%, tillers are not frozen. Indicating that the main stem complex in the booting stage, no significant difference between irrigation and non-irrigation, and irrigation tiller tillering stage increased cold resistance significantly.