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Evapotranspiração de referência na bacia experimental do riacho Gameleira – PE, utilizando-se lisímetro e métodos indiretos

2008; UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; Volume: 3; Issue: 1 Linguagem: Inglês

10.5039/agraria.v3i1a250

1981-1160

Leidjane Maria Maciel de Oliveira, Suzana Maria Gico Lima Montenegro, José Roberto Gonçalves de Azevedo, Francisco Xavier dos Santos,

Environmental and biological studies

The estimate of the evapotranspiration is very important for the determination of the water balance, especially in agricultural areas under irrigation, with direct impact on the irrigation management. This paper evaluates the reference evapotranspiration (ETo) in the experimental basin of the Gameleira rivulet – PE, using an hydraulic weighing lysimeter and indirect methods. The lysimeter has a surface area of 1.52 m 2 , depth of 0.80 m and ratio of border and surface area of 18%. Tests presented resolution of 0.1543 mm of ETo, average positional error of 2.31% and calibration with coefficients of determination higher than 0.9993. The statistic analysis was performed in daily and Five days time scales between the lysimeter (standard) and the indirect methods: Class A pan, Camargo, Makkink, Solar Radiation, Jensen-Haise, Hargreaves-Samani, Blaney-Criddle, Penman and Penman- Monteith. The methods of Jensen-Haise and Class A pan overestimated the values of the ETo compared to the lysimeter. The ETo estimated by the Solar Radiation method had the best performance in relation to the lysimeter values.