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低温冷害对农业生产是一个很大的威胁,对水稻尤为严重。北方气温低,无霜期短,低温冷害更显得突出。据统计,吉林省每3～5年出现一次低温冷害,平均一次要减产34.5%。水稻低温冷害的主要因素有两个:气温和水温,其中以水温影响为大。吉林省水库灌溉的水田面积150万亩中,绝大部分都是由水库的深孔取水,水温偏低。因此,提高灌溉水温至
Chilling injury to agricultural production is a big threat, especially for rice. Low temperature in the north, frost-free period is short, cold damage is even more prominent. According to statistics, there is a cold chilling injury every 3 to 5 years in Jilin Province, with an average reduction of 34.5% at a time. Chilling injury of rice has two main factors: temperature and water temperature, of which the impact of water temperature. Jilin Province, irrigation paddy field area of 1500000 acres, the vast majority of the reservoir is from the deep hole to take water, the water temperature is low. Therefore, to increase irrigation water temperature to