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Simulation of yield response to water and fertilizer plays a key role in improving the efficiency of agricultural water. In this regard, the purpose of this study is the calibrating and validating of the CropSyst model to evaluate the effect of nitrogen fertilization and irrigation on the growth of rice in the crop field at the Rasht Rice Research Institute between 2014 and 2015. Three irrigation treatments (continuous, around five and eight days) were considered as the main factors and the amount of nitrogen in four levels (0, 90, 120, and 150 kg N ha-1) as a sub-factor. Based on the evaluation results it can be concluded that the CropSyst model, with the normalized root mean squared error (RMSEn) 7 and 15% with explanation factor, R2 of 0.73–0.84 for simulating the rice grain yield, and also RMSEn 9 and 10%, R2 of 0.77–0.82 for simulating the biological yield, had the appropriate accuracy of the simulations. According to RMSEn 1 and 0.8%, R2 of 0.58–0.73 for simulating the leaf area index, suggested a moderate simulation. These results showed that a reasonable estimate of the model as the efficiency of a model for the grain yield, biological yield, and LAI were 0.87, 0.98, and 0.80, respectively.

ESTIMATION OF WATER PRODUCTIVITY AND CALIBRATION AND VALIDATION OF THE CROPSYST MODEL FOR RICE UNDER NITROGEN AND IRRIGATION MANAGEMENT