Effect of nitrogen application on seed protein accumulation in soybean

Effects of nitrogen on seed protein accumulation in soybean were studied in this research.Results showed that seeds protein quantity of all tested varieties increased with the development of seeds,but the accumulation rate differed in various stage.In early stage of seed formation,protein contents changed little.Fifty days later after blossom,seeds protein content of Dongnong 42 showed a continuous increasing tendency,while that of Siunog 14 and Dongnong 163 showed a decline at 60-67 days after blossom,and then went up.Nitrogen application inhibited the synthesis of protein at early stage and this effect died away with the development of seeds.The reactions of different genotypes to the quantity of nitrogen were different,Dongnong 42 needed more nitrogen compared with Dongnong 163 and Suinong 14.