Effect of Nitrogen Fertilizer on Growth Tendency,Dry Matter Accumulation and Distribution in Soybean

The effect of different nitrogen fertilizer level on the changing trends of plan about the height, leaf area index(LAI), dry matter accumulation, distribution and yield of Kennong4 were studied in this experiment. The results showed that Nitrogen fertilizer could increase the LAI and the accumulation of dry matter of whole growing-stage in contrast to N0. appropriate nitrogen levels(22.5～457.1 kg/hm2) .The high level of nitrogen(1435.4 kg/ hm2) could harmonize the dry matter outputting to every organ of soybean after pudding, and increase yield. The high level of nitrogen(946.3 kg/hm2) could accumulate more dry matter before maturation, which led to the unharmonious correlation between the storeroom and source, decline the dry matter outputting to seed, decrease the soybean yield.