Study on Dynamic Change of Nitrogen Accumulation in Different Soybean Varieties

In order to explore rules of nitrogen accumulation and translocation in soybean varieties,taking five varieties,Dongnong 42,Heinong 35,Dongnong 46,Kenfeng 9and Moshidou as experiment materials,difference of the nitrogen accumulation and distribution in different genotypes of soybean was studied.The results showed that there existed a similar nitrogen content tendency between leaves and stems,which changed in drop-risedrop.The nitrogen content in pod shells decreased gradually,while increased gradually in seeds.The gradation of nitrogen content in different organs was pod shellleafstem.The dynami change of nitrogen accumulation in leaves and stems were similar,which changed in single-peak curve.Nitrogen content in seeds kept increasing.The nitrogen content of different soybean varieties during maturity was MoshidouHeinong 35Dongnong42Dongnong 46 Kenfeng 9.The nitrogen accumulation and distribution of different soybean varieties showed that the quantity and efficiency of nitrogen translocation of high protein varieties were higher than that of other varieties,but the nitrogen harvest index was similar.The contribution rate of the quantity and efficiency of nitrogen translocation in organs showed leafstempod shell.