Effect of Different Nitrogen Level on Nitrogen Metabolic Characteristic,Grain Yield and Quality of Strong Gluten Spring Wheat

Field experiment was carried out to investigate nitrogen metabolic characteristic,grain yield and quality of northeast region spring wheat as affected by different nitrogen application level under the conditions of middle fertility soil.The results showed that it was a quadratic regression equation between nitrogen rate and grain.Y=2024.2+24.095X-0.0958X~2(R~2=0.9856,P=0.0039).The best spring wheat yield was 3539.3 kg/ha as the nitrogen application was 125.8 kg/ha.The yield was 3 507.3 kg/ha as the best economical nitrogen application was 107.5 kg/ha.In certain range of nitrogen application,with nitrogen application increased,the content of wheat chlorophyll and the activities of NRA increased,the grain quality characteristic was improved.The treatment N120 was the better at quality and dough rheological characteristics,total protein content,starch content,wet gulten content and zeleny sedimentation of grain was 17.3%,64.7%,42.5% and 65.2 mL among different treatments,respectively.To get the best grain yield and quality of spring wheat,the nitrogen application was about 120 kg/ha on middle fertility soil.