近年来,由于夏季干旱常常使旱地玉米播种晚或死苗重播,导致玉米收获期拖后,不能及时为小麦秋种倒茬。而旱地小麦又必须借上季作物生育期内积蓄于土壤中的水分播种,即必须适期抢墒播种,因此,玉米收获期与小麦播种适期相矛盾,若小麦实现 In recent years, due to the summer droughts often make the sowing of dryland corn late or dead seedling replanting, resulting in maize harvest delay, can not be timely for the fall of wheat fall stubble. However, dryland wheat must be sown by the water stored in the soil during the crop growth period of the previous season, that is, it is necessary to sow the soil with proper moisture for a suitable period of time. Therefore, the harvest period of corn is in contradiction with the sowing date of wheat,