大豆生长后期是决定粒数和粒重的关键时期,主要应保叶、保根、增荚粒、提高粒重。一、调控干湿度大豆鼓粒期对水分反应敏感。因此,当土壤水分低于田间最大持水量的70%～80%时应及时灌溉;成熟时水分不宜过大,保持田间最大持水量的60%～65%即可,如遇大雨应及时排水。二、拔除大草 Soybean late growth is to determine the number of grain and grain weight of the key period, the main leaf should be Paul, Paul roots, increased pods, grain weight increase. First, the regulation of dry and wet soybean drum grain moisture sensitive to response. Therefore, when the soil moisture is less than 70% ~ 80% of the maximum water holding capacity in the field, it should be timely irrigated; when ripening, the water should not be too large to maintain 60% ~ 65% of the maximum water holding capacity in the field; Second, unplug the grass