AVALIAÇÃO DO DESEMPENHO DE MÉTODOS DE ESTIMATIVA DA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA PARA O MUNICÍPIO DE MANICORÉ, AMAZONAS

Abstract

One of the phenomena of great importance in determining the water needs of a crop, noting periods of excess or shortage of water, is evapotranspiration. Therefore, the objective of the study is to evaluation the reference evapotranspiration methods of Blaney-Criddle, Camargo, Hargreaves-Samani, Jensen-Haise, Thornthwaite, Thornthwaite-Camargo, FAO 54 da Radiação and Blaney-Criddle-Frevest to the Penman-Monteith method, recommended by FAO as a standard method, for the municipality of Manicoré, AM. The meteorological data used were obtained from the conventional meteorological station of Manicoré of the Instituto Nacional de Meteorologia, comprising monthly data from a 10-year provisional normal. The statistical indicators used were the correlation coefficient, determination coefficient, accuracy index and safety or performance coefficient. The classification of the Jensen-Haise, Hargreaves-Samani and FAO-24 methods of radiation had an excellent performance in estimating the reference evapotranspiration, being recommended for the municipality of Manicoré, AM, having its reliable use for farmers in the region if it is not have all the variables needed to use the Penman-Monteith FAO – 56 method. The Blaney-Criddle-Frevest and Thornthwaite methods showed good and very good performance, respectively, and can be recommended through local adjustments, while the other methods did not show a good safety coefficient.