Effect of combined application of different rates of nitrogen and potassium fertilizers on grain yield and quality of winter wheat

Effect of combined application of different rates of nitrogen and potassium fertilizers on grain yield and quality of winter stronggluten wheat Jinan 17 was studied The results indicated that yields of combined application of N 210 kg/hm2 and K2O 90 kg/hm2 (N210K2O90), and N 300 kg/hm2 and K2O 180 kg/hm2 (N300K2O180) were significantly higher compared to those in other treatments Yields of grain in N210K2O90 and N300K2O180 were 67837kg/hm2 and 69503kg/hm2, respectively, but their difference was not significant The different nitrogen levels affected grain quality greatly With increase of nitrogen application rates, grain quality were improved Under N 120kg/hm2, 210kg/hm2, and 300kg/hm2 applied, their wet gluten content were 320%, 328%, and 338%, sedimentation value were 419ml, 438ml, and 492ml, dough stability were 197min, 225min, and 246min, respectively Application rates of potassium fertilizer also affected wheat grain quality, sedimentation value and dough stability in K2O 90 kg/hm2 applied was obviously higher compared to K2O 180 kg/hm2 (K2O180) applied The optimum N and K2O application rates based on benefit and quality was 2197kg/hm2 and 967kg/hm2 under this experimental condition, respectively