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The objective of the study was to estimate the reference evapotranspiration (ETo) of the city of Ariquemes (RO) and to compare the estimates by the methods of Penman-Monteith-FAO and  Hargreaves-Samani for the period 2011-2013. We used data of air temperature, relative humidity, pluviometer measurements, speed of wind and solar radiation provided by the National Institute of Meteorology – INMET and obtained the Automatic Meteorological Station of Ariquemes/RO. To compare the two methodologies were used the concordance index (d), the correlation coefficients (r), the coefficient of determination (R 2 ) and linear and angular coefficients of the regression line. Among the results, we found that the Hargreaves-Samani overestimates in every month the ETo when compared to standard method. However, the estimates were considered good.

ESTIMATIVAS DA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA DO MUNICÍPIO DE ARIQUEMES (RO) UTILIZANDO OS MÉTODOS PENMAN-MONTEITH-FAO E HARGREAVES-SAMANI