冬小麦安全越冬的基本条件是分蘖节不受冻害,而在冬季出现极度低温,往往发生冻害,使麦苗越冬死亡,减少基本苗造成减产。即使在正常年份,由于田间管理不到位,小麦贪青旺长,尤其是播种期偏早,小麦冬前分蘖数较大,也常在局部地块发生冻害。 Winter wheat winter overwintering the basic condition is that the tillering Festival is free from frost damage, and in the winter there is extremely low temperature, often freeze damage occurs, so that winter wheat seedlings died, reducing the basic seedlings caused by the reduction of production. Even in normal years, due to inadequate field management, wheat is greedy and greedy. In particular, the sowing period is earlier and the tillering number of winter wheat is larger. Frost damage often occurs in some areas.