Calibração do método de sonda de dissipação térmica na determinação do fluxo de seiva em cafeeiro.

Abstract

The calibration of the thermal dissipation probe method for mesure the sapflow of coffee tree was made in laboratory with the aid of a hydraulical system capable to print changeable pressures for simulate the sapflow through stem. This calibration is necessary therefore, few works has been made with species of tropical plants using this method and all it indicates that the universal equation, currently used for the majority of the authors, cannot directly be used with species of plants as the coffee tree. The result of this work demonstrates that the universal equation of Granier underestimation in 30% when compared with the equation of calibration made in laboratorial environment. It is important to mention that this work will have a sequence that it will consist of the validation of the equation of calibration for coffee in field conditions. Preliminary works have demonstrated that, getting a correct calibration for coffee tree, this method can be used successfully for to calculate the individual water consumption and, consequently, to serve as important tool in the planning and handling of the irrigation.