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Comparison of methods for estimating reference evapotranspiration in two locations of Espirito Santo

2014; Volume: 8; Issue: 2 Linguagem: Inglês

10.7127/rbai.v8n200225

1982-7679

Joabe Martins de Souza, Lucas Rosa Pereira, Anatan da Matta Rafael, Leandro Dias da Silva, Edvaldo Fialho dos Reis, Robson Bonomo,

Environmental and biological studies

The determination or estimate of reference evapotranspiration (ETo) is of great importance to determine the optimal supply of water to a culture. The Penman-Monteith (FAO 56) is recommended as the standard for estimating ETo, when the absence of weighing lysimeter. In the present study it was compared five methods for estimating the ETo, with the Penman-Monteith method in the dry and humid season of the year 2012, in two localities of the state of Espirito Santo, in the north (Nova Venecia) and the mountainous region (Santa Teresa). To assess the adjustment of the methods for estimating the ETo with the Penman-Monteith (FAO-56) it was used the values of the coefficients of determination (R 2 ) and correlation (r), the Standard Error of Estimate (SEE), Standard Error of Estimate Adjusted (SEEa), Standard Error of Estimate Adjusted by Origin (SEEao) for methods that showed better assessment, and the agreement indexes (d) and performance (c). The methods Priestley-Taylor, Hargreaves & Samani and Blaney & Criddle, showed better assessment when compared with the Penman-Monteith method to Santa Teresa-ES, for the two seasons studied, the first two overestimated and the Blaney & Criddle underestimated the ETo values. The methods of Camargo and Makkink, obtained lower classification of estimate of ETo. To Nova Venecia-ES in the rainy season the methods Priestley-Taylor, Hargreaves & Samani and Blaney & Criddle, obtained the best results, but the first two overestimated and the last underestimated, for the dry season only the methods Priestley-Taylor, Hargreaves & Samani showed better assessment, overestimating the values of ETo. In both seasons the methods of Camargo and Makkink obtained lower classification, as well Blaney & Criddle for the dry season. Hargreaves & Samani and Priestley-Taylor are indicated for both locations, and Blaney & Criddle, except in the dry season of Nova Venecia-ES.