我省属于寒冷稻作区,自1953年以来,全省范围内共发生5次(1954、1957、1969、1972、1976年)冷害,使水稻平均减产31%。水稻冷害不仅当年减产,还延续影响次年的再生产。近年来,我省调查了水稻冷害情况,总结了群众战低温夺高产的经验,现整理如下:一、冷害类型我省种植水稻地区,气温较低,生育期较短。生育期间的积温为2,100—3,000℃,夏季7—8月份平均气温仅19.5—23.5℃,生育日数115—150天。在我省,春秋季节寒潮活动较频繁,常出现异常低温,夏季也有异常低温出现,引起冷害。(一)延迟型冷害主要是在营养生长期,水稻 The province belongs to the area of ​​cold paddy rice. Since 1953, a total of 5 cold damage occurred in the province (1954, 1957, 1969, 1972 and 1976), reducing the average yield of rice by 31%. Chilling injury not only reduce the year, but also continue to affect the reproduction of the following year. In recent years, our province has investigated the situation of cold damage in rice and summed up the experience of the masses in fighting low-temperature and high-yielding crops. Now, they are summarized as follows: I. Types of Cold Damage Rice cultivation in our province is characterized by low temperature and short growth period. The accumulated temperature during birth is 2,100-3,000 ° C. The average temperature in July-August is only 19.5-23.5 ° C and the number of days of birth is 115-150 days. In our province, cold and wet tide activities are more frequent in spring and autumn, abnormal low temperatures often occur, and abnormal low temperatures appear in summer, causing chills. (A) Delayed cold damage is mainly in vegetative growth period, rice