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Amethod of estimating potential evapotranspiration of reference crop using only temperature data was presented by Hargreaves and Samani. This paper reports on a comparison of this method with several other methods including those of Hargreaves, Jensen-Haise, modified Jensen-Haise, Penman, Blaney-Criddle, and Pan evaporation to evaluate the suitability of this method for climates similar to Mesa (Arizona). It was concluded that for climates similar to Mesa (Arizona), Hargreaves and Samani's equation can be used to estimate the monthly potential evapotranspiration of alfalfa reference crop with reasonable accuracy.
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Samani et al. (1986) studied this question.
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