Simulation and Sensitivity Analysis of Summer Maize Yield under Different Nitrogen Application Treatments Based on APSIM Model
Based on field trials,this study employed a crop simulation model to investigate the impact of vary-ing fertilizer applications on the yield of summer maize and to analyze the sensitivity of summer maize yield to cli-mate change.Additionally,the suitability of the APSIM model in simulating the yield of summer maize in the region was evaluated.The results demonstrated that the APSIM model performed exceptionally well in simulating the yield of summer maize in the area,with linear regression coefficients R2 of 0.952 5 and 0.983 0,normalized root mean square errors(NRMSE)of 5.567％and 7.434％,and model consistency evaluation indices D of 0.972 and 0.993.Uti-lizing meteorological data from Chongzhou City for simulation,the findings indicated that among all compound fertil-izer treatments,the optimal yield of summer maize was achieved with an application rate of 890 kg/ha for the 15-15-15 formulation.The average annual temperature and rainfall were identified as the most sensitive climatic factors af-fecting the simulated yield of summer maize under different fertilizer treatments,with sensitivity indices showing positive correlations across treatments.
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