大豆产量是由单位面积上的株数,每株结实荚数,每荚粒数及粒重构成。在这四个产量构成因素中,单位面积上的株数又制约着其它三个因素。为了探索贺兰山东麓沙质淡灰钙土地区单作大豆的适宜群体结构,我们于1982—1984年先后在玉泉营、黄羊滩、贺兰山农牧场以及区农垦科研所,设置了五 Soybean yield is determined by the number of plants per unit area, pods per plant, pods per grain and grain weight composition. Among these four factors of production, the number of trees per unit area constrains the other three factors. In order to explore the appropriate group structure of sandy soils in the area of ​​sandy foothills in the Helunshan Mountains, we set up a series of five groups, namely, Yuquanying, Huangyangtan, Helan Mountain Ranch and the Farmerland Reclamation Research Institute from 1982 to 1984,