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Abstract
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In this study, an experiment was performed to assess and rank different evapotranspiration models. This was done to estimate the daily actual evapotranspiration of corn using a single (Kc-single) and dual (Kc-dual) crop coefficients in the semi-arid climate of Karaj, Iran, in 2014. Daily evapotranspiration calculations using one combination-based model, one pan evaporation-based model, nine temperature-based models, ten radiation-based models and seven mass transfer-based models were compared to the lysimeter measurements. Considering the single crop coefficient, the Hargreaves-M3 model (RMSE= 1.89 mm/day) in the temperature-based models, the Caprio (1974) model (RMSE= 1.99 mm/day) in the radiation-based models and the Albrecht (1950) model (RMSE= 4.33 mm/day) in the mass transfer-based models were ranked in the first place. Moreover, the Hargreaves-M2 model (RMSE= 0.88 mm/day) in the temperature-based models, the Caprio (1974) model (RMSE= 1.17 mm/day) in the radiation-based models, as well as the Albrecht (1950) model (RMSE= 3.76 mm/day) in the mass transfer-based models using the dual crop coefficient, provided the most accurate estimation of daily corn evapotranspiration as compared to the lysimeter measurements.
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