冻害是冬小麦在越冬期或早春低温造成的，是北部地区小麦生产的重大灾害之一。小麦冻害是多种因素综合作用的结果。主要可分为内部因素与外部因素两大类。 一、内因 主要指小麦本身抗御寒性的能力，一般若选用抗寒性差的品种，则冬季死苗现象严重；播种过早，麦苗冬前生长过旺? Frost damage is caused by winter wheat overwintering or early spring, and is one of the major disasters of wheat production in the northern region. Frost damage to wheat is the result of a combination of many factors. Can be divided into two major categories of internal and external factors. First, the internal refers mainly to the ability of wheat itself to resist cold, cold weather if the general choice of species, then the phenomenon of dead seedlings in winter severe; sowing too early, before the growth of wheat seedlings too busy?