Modelo para coeficiente de tanque classe "A" para o semi-árido agrícola do nordeste brasileiro.

Abstract

This work was conducted in the of Governador Dix-Sept Rosado city (RN), with climate data of november of 1987 to december of 1989. Pan mean coefficients for this locality were obtained by the relation between ETo data measured in constant watertable lisimeters and evaporation measured in class A pan (Kt1), and by the relation between ETo estimated by Penman-Monteith model and evaporation measured in class A pan (Kt2). The coefficients indicate that the Kt proposed by FAO-24 bulletin superestimate the reference evapotranspiration measured by class A pan. The maximum Kt found were 0,73 for Kt1 and 0,64 for Kt2.