INFLUENCE OF METEOROLOGICAL EVAPOTRANSPIRATION IN REFERENCE ESTIMATED USING UP THE IRRIGAMETER IN THE MUNICIPALITY OF GUANAMBI-BA - DOI: 10.13083/1414-3984/reveng.v23n3p251-260

Abstract

There are few studies on the behavior and interactions of meteorological elements on evaporation or evapotranspiration occurring in evaporimeters as the Irrigameter. Therefore, the aim of this study to analyze the effects of the interactions of weather elements, maximum temperature and minimum air, relative humidity, wind speed and solar radiation, the estimated reference evapotranspiration using the Irrigameter, operating in different heights of water level in evaporator. The study was conducted in the experimental area of the Federal Institute of Bahia, located in the municipality of Guanambi-BA. The experiment was a completely randomized design with seven treatments and three repetitions. The treatments were individually equipped with Irrigameters operating with equal water levels in the evaporators from 1 to 7cm, taken from a the reference level of the device, totaling 21 Irrigameters. To assess the direct and indirect effects of each meteorological variable on the reference evapotranspiration estimated by Irrigameter, the path analysis was used which correlates evapotranspiration, the dependent variable, with meteorological elements, the independent variables. In all water levels studied the meteorological elements that best correlated with the estimated reference evapotranspiration were relative humidity, solar radiation and wind speed, with values equal to 0.58, 0.53 and 0.49, respectively.