大豆在一般的栽培条件下,具有主要依靠自生固N作用的明显特征。N的积累量多,在收获期大部分积累于籽粒中。有人认为根瘤中固定的N主要是以尿囊素(1—尿基间2氮杂蔑烷二酮——的形态从根部向上转移。这种形态特别利于籽粒生产。然而也有实验结果证明,多施化合态N肥也能增产。有人推测,由于氮从根瘤中被运走的速度加快,促进了根瘤固N能的形成。但有不少 Under general cultivation conditions, soybeans have distinct features that rely primarily on the role of autotrophic nitrogen. The accumulation of N is large, most of the accumulation in the grain during harvest. Some people think that the nodules in the fixed N is mainly allantoin (1-urinary-based 2 azathiazolidinedione - up from the root of the transfer form, this form is particularly conducive to grain production, but there are experimental results show that more Fertilization of N fertilizers can increase production.It is speculated that due to the nitrogen from nodules to be removed faster, to promote the formation of nodules solid N energy.However, there are many