| dc.description.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. | en_US |