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The objective of this study was the evaluation of the Ceres-Rice model under different density and water management options in Semi-Mediterranean climate condition. An experiment was conducted in a randomized complete block design (RCBD) with three replications in north of Iran during cropping seasons of 2014 and 2015. There were 5 levels of irrigation treatments in this research including: I1: Flood irrigation, I2: Saturation, I3: Irrigation with 8 days alternative before anthesis, I4: Irrigation with 8 days alternative after anthesis, I5: Irrigation with 8 days alternative whole growth season) and there were three plant spacing including: D1 = 15 × 15, D2 = 20 × 20, D3 = 25 × 25cm. Evaluation simulated and measured grain yield, total crop biomass, and crop biomass by adjusted coefficient of correlation and by absolute and normalized root mean square errors (RMSE). Grain yield of D2 was predicted the most accurate than other density treatments (RMSE = 439 and RMSEn = 11%). Biomass of D2 was predicted the most accurate than other density treatments (RMSE = 873 and RMSEn = 9%). Observed and predicted planting densities by rice showed good agreement in both calibration and evaluation steps. The Ceres-Rice model can be applied to research purposes (irrigation and planting densities) under northern Iranian conditions.

CALIBRATION AND EVALUATION OF CERES-RICE MODEL UNDER DIFFERENT DENSITY AND WATER MANAGEMENTS