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我省年平均气温一般在零下5℃至4℃,无霜期90—140天,活动积温南部为2,700℃,北部为1,900℃,且年度间波动较大,高低相差700℃。因此,农作物常因遭受低温冷害而减产。一般每三、四年就出现一次低温冷害,低温冷害伴随着干旱则对农作物影响更大。从作物来看,受害程度的深浅依次为高梁、谷子、玉米、水稻、大豆、小麦。但是,同样是低温年,粮食总产量却有增有减,所以总结我省战低温促早熟,做到灾年不减产的经验有着重要的意义。
The annual average temperature in our province is generally minus 5 ℃ to 4 ℃, the frost-free period is 90-140 days, the active accumulated temperature is 2,700 ℃ in the south and 1,900 ℃ in the north, with a great fluctuation between the year and the difference of 700 ℃. As a result, crops are often cut as a result of chilling damage. Generally every three or four years there is a chilling injury, chilling damage with the crop has a greater impact. From the crop point of view, the degree of damage in order of sorghum, millet, corn, rice, soybeans, wheat. However, in the same low-temperature year, the total grain output has increased and decreased. Therefore, it is of great significance to sum up the experiences that low-temperature warfare is premature in our province and the experience of preventing the disaster year from decreasing.