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EnglishThis work had the objective of a comparative study of the empirical equations for the estimate of the reference evapoperspiration in comparison to Penman-Monteith FAO 56 universal standard method for the conditions climate from the municipalities of Sooretama, Cachoeiro de Itapemirim and Venda Nova do Imigrante located, respectively, in the north, south and mountainous regions of the state Espirito Santo. Climate variables were used referring to this dry period (June, July and August) in 2006. They were obtained from data platform of CPTEC-INPE from the agrometeorological automated stations code number 31957, 31958 and 31959 installed in the municipalities mentioned. Making a comparison between the values of ETo estimated by the empirical equation and the universal standard method Penman-Monteith FAO 56 there were considered the regression equation parameters ..0 and ..1, determination coefficient r2, correlation coefficient r, standard of the error estimate EEP, the agreement index d, confidence or performance index c, in the diary scales, three, five and seven days, for the months studies in the three localities. To the three places studied in the rainy dry period, they stood out as better methods in the order Penman 48 Original, Priestley-Taylor, FAO 24 Penman Modify, FAO 24 Blaney-Criddle, Turc (61), FAO 24 Radiation, Makkink. portuguesO presente trabalho teve como objetivo realizar o estudo comparativo das equacoes empiricas para estimativa da evapotranspiracao de referencia em comparacao ao metodo universal padrao Penman-Monteith FAO 56 para as condicoes climaticas dos municipios de Sooretama, Cachoeiro de Itapemirim, Venda Nova do Imigrante, localizados respectivamente, nas regioes Norte, Sul e Serrana do Estado do Espirito Santo. Foram utilizadas as variaveis climaticas referentes ao periodo chuvoso (outubro, novembro e dezembro) do ano de 2006 obtidas via plataforma de dados do CPTEC - INPE provenientes das estacoes automatizadas agrometeorologicas codigos no 31957, 31958 e 31959 instaladas, respectivamente, nos municipios mencionados. Para comparar dos valores de ETo estimados por meio das equacoes empiricas com os do metodo universal padrao Penman-Monteith (FAO 56) foram considerados os parâmetros da equacao de regressao ..0 e ..1, coeficiente de determinacao (r&), coeficiente de correlacao (r), estimativa do erro padrao (EEP), indice de concordância (d), indice de confianca ou desempenho (c), nas escalas diaria, tres, cinco e sete dias, para os meses estudados nas tres localidades. Para as tres localidades estudadas no periodo seco chuvoso, destacaram-se como melhores metodos na ordem Penman (48) Original, FAO 24 Pn Mod., FAO 24 BC, Priestley-Taylor, Turc (61), Makkink e Hargreaves-Samani.

ESTUDO COMPARATIVO DA ESTIMATIVA DA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA NO PERÍODO CHUVOSO PARA TRÊS LOCALIDADES NO ESTADO DO ESPÍRITO SANTO