大豆生产是群体生产,只有在良好个体发育基础上才会有较高的群体生产。但是,过大的群体籽实产量往往不高。所以,欲获得大豆高产必须协调好营养生长和生殖生长、个体发育和群体生产之间的两个矛盾,这是大豆高产栽培的中心环节。大豆生长分为营养生长期、营养生长和生殖生长交错期、生殖生长期。营养生长期的主攻目标是使大豆形成一个健壮繁茂的营养体,为多开 Soybean production is a group production, and there is a higher population production only on the basis of good individual development. However, the output of large groups of seeds is often not high. Therefore, to obtain high yield of soybean, two contradictions between vegetative growth and reproductive growth, individual development and population production must be coordinated. This is the central aspect of high yielding cultivation of soybean. Soybean growth is divided into vegetative growth, vegetative and reproductive growth staggered, reproductive growth. Nutritional growth of the main goal is to make soybeans to form a strong and lush nutrition, to open more