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我省属大陆性季风气候,是我国最冷的省份,年平均气温一般在-5℃～4℃之间,无霜期90～140天,作物生育期间活动积温为1900～2700℃,年际间变化比较大,农作物生育期间常遭低温冷害。因此,防御低温冷害是我省粮食稳产高产的一项战略性措施。许多高产单位和科研部门所提供的经验
My province is a continental monsoon climate, is the coldest province in China, the average annual temperature is generally -5 ℃ ~ 4 ℃, frost-free period 90 to 140 days, crop accumulated during the activity accumulated temperature 1900 ~ 2700 ℃, year-on-year changes Large, chilling injury during crop growth. Therefore, the prevention of chilling damage is a strategic measure for stable and high yield of grain in our province. Many high-yielding units and research departments provide the experience