Crop simulation models (CSM) are now widely used to predict the future crop yields, to find the suitable measures for increase the crops productivity and to simulate the potential effects of genetic characteristics, irrigation water, soil and climatic conditions, together with the management practices on yield. The objective of this work is to evaluate the ability of AquaCrop model to simulate growth and yield of pomegranate under different climatic conditions, soil and irrigation water. Experiments were conducted during 2016 and 2017 seasons in tow governorates of Egypt (ElBehera and North of Sinai). The data required to run the AquaCrop model relate to climate were obtained from the America's space agency (NASA) and the physical and chemical characteristics of soil and irrigation water for different study locations were obtained from field sample analysis of soil and irrigation water. The validation and calibration of model was performed using field observations relative to yield data in 2016 and 2017. The results show the observed values of pomegranate yield in the field were greater than the simulated values in two seasons of study 28.543, 30.433 for first location of study (ElBehera) respectively and 10.638, 10.978 ton/ha for second location of study (North of Sinai) respectively, but the differences between them were very low. The averages of annual climatic data have the most significant impact on pomegranate yield. The agreement between observed and simulated yield data was good with root mean square error (RMSE), index of agreement (D) and coefficient of determination (R 2). Statistical indicators, RMSE, D and R 2 confirmed that the model is very reliable for simulating pomegranate yield for experiments (ElBehera and North of Sinai) in 2016 and 2017 seasons (low RMSE, D and R 2 near 1), The relationship between observed and simulated yield produced RMSE ranged from 0.53 to 9.11%, D ranged from 0.985 to 0.994 and (R 2) = 0.99. It was concluded that calibrated AquaCrop model was able to simulate growth and yield of pomegranate in tow experiments.

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