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This study aimed to compare the reference evapotranspiration values obtained by using the Penman-Monteith method with the empirical methods of Hargreaves-Samani, Camargo, Priestley-Taylor, Turc and Makking. The data were obtained from the automatic station database of the weather station of Piracicaba-SP, located in the Escola Superior de Agricultura "Luiz de Queiroz" ESALQ/USP, between the period from January 1, 2012 to November 30, 2014. For the accuracy of empirical methods, the analysis was performed to determine the concordance index, the performance index, and the estimated standard error. Empirical methods had limited use, and Hargreaves-Samani was considered the method unsuitable for use in Piracicaba-SP, since the region where it originated the method have different characteristics. Methods of Turc and Camargo were more suitable for the estimation of reference evapotranspiration in PiracicabaSP.

DESEMPENHO DE MÉTODOS EMPÍRICOS PARA A ESTIMATIVA DA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA EM PIRACICABA, SP