Abstract:
Studies were conducted to establish an equation which would be useful in predicting evapotranspiration (ET) for upland paddy. The parameters of the equation are temperature, sunshine hour, wind velocity and relative humidity in the form of equation ET = P[(TSW/R)]x100. In order to find out the evapotranspiration, the predetermined value of P, i.e. the evapotranspiration constant is required for estimating ET. A quadratic equation (P = 0.00001772 + 0.00107045W-0.00006049W2) has been developed for estimating P following a curvilinear relationship of P with weeks of growth W.
