ABSTRACT:One approach to verify the adequacy of estimation methods of reference evapotranspiration is the comparison with the Penman-Monteith method, recommended by the United Nations of Food and Agriculture Organization -FAO, as the standard method for estimating ET 0 . This study aimed to compare methods for estimating ET 0 , Makkink (MK), Hargreaves (HG) and Solar Radiation (RS), with Penman-Monteith (PM). For this purpose, we used daily data of global solar radiation, air temperature, relative humidity and wind speed for the year 2010, obtained through the automatic meteorological station, with latitude 18° 91' 66" S, longitude 48° 25' 05" W and altitude of 869m, at the National Institute of Meteorology situated in the Campus of Federal University of Uberlandia -MG, Brazil. Analysis of results for the period were carried out in daily basis, using regression analysis and considering the linear model y = ax, where the dependent variable was the method of Penman-Monteith and the independent, the estimation of ET 0 by evaluated methods. Methodology was used to check the influence of standard deviation of daily ET 0 in comparison of methods. The evaluation indicated that methods of Solar Radiation and PenmanMonteith cannot be compared, yet the method of Hargreaves indicates the most efficient adjustment to estimate ETo.
ResumoOs resíduos ou adubos orgânicos aplicados ao solo são fontes de matéria orgânica que promovem melhoria em propriedades físicas e químicas do solo, aumentando a sua capacidade produtiva. Objetivou-5
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