COEFICIENTE DE CULTIVO PARA CENOURA SOB A PERSPECTIVA DE DIFERENTES MODELOS MATEMÁTICOS DA EVAPOTRANSPIRAÇÃO DE REFERÊNCIA

Abstract

The crop coefficient is an essential parameter for the design and management of irrigation systems and rational use of water. Thus, the objective of the present work was to determine the crop coefficient of the carrot through different mathematical models of reference evapotranspiration in the harsh Alagoas. The experiment was performed in the experimental area of the Campus of the Federal University of Alagoas (UFAL), in the municipality of Arapiraca-AL. Three lysimeters of drainage were used, installed on a bed with dimensions of 3.5 x 1.0 m in length and width respectively with a total area of 3.5 m². The Kc was obtained by the relationship between crop evapotranspiration (ETc) and reference evapotranspiration (ETo) estimated by the methods of Penman-Monteith (FAO standard), Hargreaves-Samani, Solar Radiation, Blaney-Criddle and Priestley-Taylor. The values of Kc obtained were: KcPM(0.61; 1.00; 1.26 and 0.99), KcHS (0.63; 1.09; 1.27 and 0.94), KcRS ( 0.65; 1.03; 1.36 and 1.06), KcBC ( 0.69; 1.11; 1.52 and 118) and KcPT ( 0.67; 1.08; 1.25 and 0.99) for the initial, growth, intermediate and final phases, respectively. In the absence of agrometeorological information to estimate ETo by the standard method, it is recommended to use the values obtained by Blaney-Criddle ETo method.