Effect of nitrogen on root system, dry matter accumulation and yield of high yield soybean

Within the range of nitrogen used quantity and the condition of this study, the control of nitrogen on the form of nodule of Heinong 41 which has the yield potential of more than 4 500 kg·hm~(-2) increased along with the increasing of quantity of nitrogen used. Nitrogen fertilizer can put off the appearance of fastigium of bleeding, increased the LAI and the accumulation of dry matter of whole growing-stage. Nitrogen fertilizer increased the structure factor of yield and the yield, too. In the condition of 90 kg·hm~(-2) nitrogen used at flowering-stage, the yield of the spring soybean reached 5 012.55 kg·hm~(-2).