“春收三月雨,单怕二月寒”。二月寒即指阳历3月倒春寒。淮北地区每年都有不同程度的春霜冻。尤其是1983年,在小麦返青期,遇到历年少有的二、三月两次冻害。调查统计冻害面积,零级冻害占10%以上,一级冻害占50%以上,二级冻害占20%以上,三级冻害占20%以下。受冻害的麦田,收获时穗头少,粒数少,一般减产10—32%。 “Spring harvest March rain, single fear February cold.” February refers to the cold February calendar Yangchun cold. Huaibei every year, varying degrees of spring frost. Especially in 1983, during the wheat turning-green period, it experienced rare freezing frostbite in February and March in previous years. Investigation and statistics of frostbite area, zero freezing damage accounted for more than 10%, a frost damage accounted for more than 50%, two frost damage accounted for more than 20%, three frost damage accounted for 20% or less. Frost damage to the wheat field, harvest less head, fewer grains, the general cut 10-32%.