الفهرس 
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Abstract
This study aimed to: This study was conducted for comparing, testing and evaluating the three most well-known irrigation scheduling models (CROPWAT, CAMISM and IRRIS) under Egyptian conditions to determine the best used model. Methods & Results: This study was conducted for comparing, testing and evaluating the three most well-known irrigation scheduling models (CROPWAT, CAMISM and IRRIS) under Egyptian conditions. The study was focused on Dakahlia governorate. So, the selected crops for examination were Wheat, Bean and Egyptian clover (winter crops) and Corn, Tomato and Potato (summer crops). Surface irrigation system (50 % efficiency) The weather data used in this study are mainly daily base meteorological data. The comparing parameters among tested models included the following: Input data - Output parameters - (ETo) – NIWR- GIR - Irrigation scheduling- Deficit irrigation strategy in relation to crop yield the results were: The ETo values for CAMISM has the most significant linear relationship with CROPWAT than IRRIS model as the coefficient of determination for example in wheat crop were 0.99 for CAMISM and 0.98 for IRRIS. The NIWR values of CROPWAT model is the only values not exceeded the fasting date among the tested models values for different crops at different soil types. The CROPWAT model recorded the lowest number of irrigations with highest amounts for each irrigation run according to the model calculation. Conclusion: Finally, this study indicated that although CROPWAT model require some experience over the two others models CAMISM and IRRIS but it is preferred to be used for irrigation scheduling under Egyptian conditions due to its accuracy, nearest to the farmer culture and availability for many options, followed by CAMISM model.