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The AquaCrop model was verified with field measured data, the key parameters of the model were obtained, and the pressure coefficient related to fertilizer stress under different nitrogen application levels was quantified. On this basis, a semi-quantitative parameterization scheme was proposed, which realized the optimal management of nitrogen application rate of winter wheat in North China. The results showed that a)the determining coefficient R² of canopy coverage during the model verification is greater than 0.876 and NRMSE is less than 15.554%. The R² of the simulated and measured values of soil moisture is greater than 0.840 and NRMSE is less than 9.960%. The R² between simulated and measured yield values is greater than 0.964 under all treatments. It shows that the verified model can better simulate the process of crop growth and eventual yield formation under different nitrogen application treatments. Therefore, it can be used to study how to optimize the application of nitrogen. b)The semi-quantitative method of the model is used to realize the multi-scenario simulation of nitrogen fertilizer. According to the simulation results, the relationship between the amount of nitrogen application and the yield is establish. The results show that when the amount of nitrogen application reaches to 355.30 kg/hm², the yield of winter wheat shows a downward trend with the increase of nitrogen application. [ABSTRACT FROM AUTHOR]

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