Better Performance of the Modified CERES-Wheat Model in Simulating Evapotranspiration and Wheat Growth under Water Stress Conditions

Crop models are important for understanding and regulating agroecosystems. Although the CERES-Wheat model is an tool winter wheat research, it has some limitations under water stress conditions. To narrow gap, this study aimed to improve performance of in arid semi-arid regions based on experimental data from 2012 2014. The Priestley–Taylor (PT) FAO56 Penman–Monteith (PM) equations were used calculate reference crop evapotranspiration further modified coefficient CERES simulation accuracy yield results showed that: before jointing seriously affected simulating biomass grain yield, so was necessary original model. In improved models, PM equation lower than that PT. addition, higher (the average RMAE RRMSE less 30%). general, among four scenarios, PT calculating had best performance. Water occurred at heading filling stages, simulated good agreement with observed results, which better soil content later growth stages. Therefore, change response function positive effects This provided a applying areas.