玉米较大豆早播和晚播两个系列的试验说明:差期播种生产率低于适期(4月中旬)同播。4月30日可视为播期敏感的临界点。王米差期晚播对产量的限制因素是7月份的伏旱,大豆差期晚播受季节性和竞争性双重影响也使产量剧减。晚播下,玉米与大豆同期间作较玉米单作稳产,宜适当增加大豆在间作中的比例。差期间作中,玉米晚播不迟于5月上旬,大豆晚播须考虑品种的季节稳定性及竞争耐性。 Maize vs. Soybean Sowing and Nocturnal Sowing Two series of experiments show that poor sowing productivity is lower than the normal (mid-April) co-sowing. April 30 can be regarded as the critical point of sowing sensitive. The late afternoon sowing of Wangmi was the limiting factor on production due to the July drought. The seasonal and competitive dual effects of late sowing of soybean also caused a sharp drop in output. Evening sowing, corn and soybean during the same period as a single crop for corn, should be appropriate to increase the proportion of soybean in the intercropping. During the poor, corn late broadcast no later than early May, late seeding soybean varieties to be considered seasonal stability and competition tolerance.