The assessment of ORYZA2000 model in Simulating the Production of Rice Genotypes under pond and water stress management conditions

To evaluated ORYZA2000 model, an split-Plot in RCBD experiment with three replication. A two-year field experiment was conducted at the experimental farm of the Iranian Rice Research Institute in Rasht, from 2012 to 2013. The main factor was irrigation management at three levels (flooded and water stress) and sub-factors include rice genotypes. The goodness-of-fit between observed and simulated grain yield and final biomass was assessed by means of the coefficient of determination (R2), the absolute and normalized root mean square errors (RMSE). The results indicated, the RMSEn for predicting grain yield in calibration and validation phases for rice genotypes was assessed in the range of 4 to 16 and 9 to 17 percent respectively and the RMSEn for predicting amounts of biological yield in calibration validation and phases for rice genotypes was assessed in the range of 8 to 15 and 9 to 19 % respectively. Results show that, coefficient of determination values for grain yield and biological yield, 0.78-0.94 and 0.84-0.88, respectively. Results show that, ORYZA2000 could be used successfully to support irrigation management under the pond and vegetive water stress conditions.