Effects of Different Nitrogen and Potassium Levels on Wheat Yield and Uptake and Utilization of Nitrogen and Potassium Nutrients

[Objective] The research aimed to provide theoretical and technical basis for the scientific application of nitrogen(N) and potassium(K) fertilizers in the production of wheat.[Method] The effects of different N and K levels on wheat yield and uptake and utilization of N and K nutrients were researched by using randomized block design in the field experiment.[Result] The wheat yield of treatment N210K150 was highest and it was up to 7 950.0 kg/hm2.The increase range in yield of applying K fertilizer alone was 5.89%-11.0%.When the N application amount was 180,210 and 240 kg/hm2,the increase ranges in yield of K fertilizer were up to 17.87%-26.62%,19.18%-27.10% and 20.12%-28.18% resp.When there was no K fertilizer applied,the increase range in yield of N fertilizer was 9.41%-11.67%.When the K application amount was 75 and 150 kg/hm2,the increase ranges in yield of N fertilizer were 72.54%-84.42% and 76.81%-87.61% resp.The contribution rates of N and K application amounts and their interaction to the yield of Yannong 19 were 82.90%,14.63% and 2.47% resp.When there was no K fertilizer applied,the uptake and utilization rate of N was 38.61%-45.16%.When the K application amount was 75 and 150 kg/hm2,the uptake and utilization rates of N were 40.82%-48.68% and 43.87%-50.71% resp.When there was no N fertilizer applied,the uptake and utilization rate of K was 8.79%-12.84%.When the N application amount was 180,210 and 240 kg/hm2,the uptake and utilization rates of K were 11.24%-12.60%,16.87%-17.90% and 16.27%-16.34% resp.[Conclusion] The alone applications of N and K fertilizers could enhance wheat yield significantly and the effect of their reasonable combined application was better.