适期播种,是冬小麦安全越冬,获得高产的重要条件。播种过早,麦苗在越冬前生长过旺、抗寒力弱,往往容易受冻害。播种过晚,麦苗在越冬前因生长期太短,分蘖少,根系发育不好,没有受到充分的耐寒锻炼,对低温的抵抗力弱,同时,也影响产量。生产实践证明,我省冬小麦从播种到麦苗地上部分停止生长,一般要有50～60天的时间,麦苗长出3～4个 Appropriate sowing, winter wheat winter, access to high yield an important condition. Early sowing, wheat seedlings overwintering before winter, cold hardiness, often vulnerable to frost damage. Sowing too late, before the winter wheat seedlings because of the growth period is too short, less tillers, root development is not good, not fully cold hardiness, low resistance to weak, but also affect the yield. Production practice has proved that the province of winter wheat from sowing to wheat shoots to stop growing on the ground, generally have 50 to 60 days, wheat seedlings grow 3 to 4