河北省耕作制度以小麦+玉米一年两作为主要形式,但光热资源属于一季有余、两季紧张的状态。近年,由于大气温室效应的影响,小麦冬前积温高、苗情旺,管理变得被动。为此,2007年秋河北省提出了“小麦适当晚播、玉米适当晚收”的“两晚”管理措施,以延长玉米生育期和提高千粒重,进而达到玉米增产的目的。推广玉米适当晚收增产技术简便易行,不增加农业生产成本,只通过延长玉米收获期就可以大幅度提高玉米产量。 Tillage system in Hebei Province wheat + corn a year as the main form, but the light and heat resources are more than a quarter, two seasons tension. In recent years, due to the effects of the greenhouse effect of the atmosphere, the winter wheat has high accumulated temperature before winter and its management has become passive. Therefore, in the autumn of 2007, Hebei Province proposed “two nights” management measures such as appropriate evening sowing of wheat and suitable evening harvest of corn so as to extend the growth period of maize and raise the grain weight of 1000, so as to achieve the goal of increasing corn yield. Popularization of corn Appropriate late harvesting technology is simple and convenient, does not increase agricultural production costs, only by extending the corn harvest can greatly improve the yield of corn.