Effect of Nitrogen Application on Growth and Economic Benefits of Winter Wheat

[Objective] The aim was to determine the suitable application amount range of nitrogen(N) fertilizer on winter wheat in Jianghuai hilly land of Anhui Province.[Method] Five treatments of different N application rates of 0,60,120,180 and 240 kg/hm2 were set up in the test.When the wheat was matured,25 plants were randomly selected in each plot for inspecting the yield components,and seed yield every plot of wheat was observed.[Result] The N application could obviously promote the growth of winter wheat,raise seed yield and increase profit.Wheat yield increased by 18.63%-34.09% and 15.22%-30.80%,averagely increased by 24.66% and 22.32%,respectively compared the treatments of different N application rates with the control in two years.The N application rates for highest seed yield were 185.9 and 189.1 kg/hm2,and that for optimum yield were 143.1 and 133.2 kg/hm2,respectively.The profit improved by 1571-4141Yuan/hm2,and the value cost ratio reached 2.33-8.68∶1.[Conclusion] Under the current production level,the suitable nitrogen application rate for winter wheat in Jianghuai hilly land was about 165 kg/hm2.