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1 RESUMO O presente trabalho tem por objetivo realizar um estudo sobre a estimativa da evapotranspiracao de referencia a partir da equacao de Penman-Monteith/FAO, fazendo-se uso de quatro equacoes de estimativa nos calculos medios diarios do saldo de radiacao solar. Os dados utilizados compreenderam o periodo de janeiro a dezembro de 2002 e foram obtidos em uma estacao meteorologica automatizada, localizada no municipio de Paraipaba, Estado do Ceara (latitude de 3o26’S, longitude de 39o08’W e altitude de 31m). No calculo, para obtencao do saldo de radiacao solar diario, utilizaram-se as equacoes de radiacao global proposta por quatro metodos objetivando avaliar qual o melhor para ser utilizado na estimativa da evapotranspiracao de referencia atraves da equacao de Penman-Monteith-FAO. Os resultados mostram que todas as metodologias apresentaram R 2 muito baixos, entre 0,16 e 0,38 em relacao a ETo (FAO), sendo o metodo de Aguiar et al. o melhor. Palavras-chave: Penman-Monteith, ETo, saldo de radiacao INFLUENCE OF ESTIMATION METHOD OF GLOBAL SOLAR RADIATION IN REFERENCE EVAPOTRANSPIRATION 2 ABSTRACT This study aims to estimate reference evapotranspiration from Penman-Monteith/FAO equation, using four equations to calculate the solar radiation  average daily balance. The data used was from January to December 2002 and were obtained from an automated weather station located in Paraipaba, State of Ceara (atitude 3° 26'S, 39° 08'W longitude and altitude of 31m). In the calculation, to obtain the balance of daily solar radiation, we used the equations of global radiation by four mlethods to evaluate which was the best to be used in reference evapotranspiration by Penman-Monteith equation, FAO. The results show that all methods presented very low R 2 between 0.16 and 0.38 relative to ETo (FAO), and the method of Aguiar et al. was the best. KEYWORDS: Penman-Monteith, ETo, net radiation

INFLUÊNCIA DA METODOLOGIA DE CÁLCULO DA RADIAÇÃO SOLAR GLOBAL NA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA