大豆是自交作物，天然杂交率为０３％～１１％。按一般规律，在没有其它品种混杂的情况下，品种的基因纯合后基本不再分离和退化。实际上，有些品种在应用于生产的初期种性较好，不长时间就严重退化而淘汰，给生产带来不应有的损失。一、造成品种退化的原因１随着基因... Soybean is an inbred crop with a natural hybridization rate of 03% -11%. According to the general law, in the absence of other varieties of mixed cases, the variety of genes after homogenization basically no longer separate and degenerate. In fact, some species used in the early production of better species, not a long time on the serious degradation and elimination, to bring undue losses to the production. First, the reasons for the degeneration of varieties 1 With the gene ...