春季晚霜冻害对三麦危害的面积很广,在江苏省也是影响三麦生产的重大自然灾害之一。近年来晚霜造成三麦冻害的情况相当頻繁,江苏省淮北地区一九五二年到一九六二年的十一年中发生过六次,使得較大面积的小麦遭受不同程度的冻害而减产,其中尤以一九五三年、一九五四年及一九六一年三年三麦受冻面积最大。对于这一重大自然灾害,目前虽然还缺乏有效的防御方法,但近 Spring frost damage to the area of ​​Sanmai harm is very wide, in Jiangsu Province is also one of the major natural disasters that affect the production of three wheat. In recent years, night frost caused three wheat frost damage quite frequently. In Huaibei area of ​​Jiangsu Province, there were six occurrences in eleven years from 1952 to 1962, which resulted in the decrease of frost damage on a large area of ​​wheat Among them, the three wheat frost areas were the driest in 1935, 1954 and 1961 respectively. At present, there is no effective defense against this major natural disaster, however