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我国北方,甚至南方都存在着不同程度的农作物冷害,影响农业生产的发展。近年来,冷害问题已引起重视。按年份平均,我国北方地区平均每3—5年发生一次冷害。如解放后的二十八年中,东北地区就发生低温冷害八次,仅一九七六年由于低温冷害就造成东北三省粮食减产一百多亿斤。高温热夏年和低温冷夏年造成黑龙江省粮食产量大幅度波动,如一九七六年为低温冷夏年,黑龙江省因冷害减产粮食总产仅只240多亿斤。而一九七八年为高温
In northern China and even in the south, there are varying degrees of cold damage on crops that affect the development of agricultural production. In recent years, the chilling problem has drawn great attention. According to the average of years, an average of one chilling injury occurs in every 3-5 years in northern China. For example, in the 28 years after the liberation, cold damage occurred in the northeastern region eight times. In 1976 alone, more than 10 billion pounds of grain was cut in the three northeastern provinces due to chilling damage. High temperature and hot summer and cold summer led to significant fluctuations in grain output in Heilongjiang Province. For example, in 1976, when cold and cold in summer, the output of grain in Heilongjiang Province was only over 2.4 billion kilograms. While in 1978 it was hot