the DSSAT model is a reliable tool for simulation of the wheat and urd cropping system. During the sequential simulation the model performance was good. During vegetative phase of wheat, the temperature and ET were low while during reproductive phase, temperature and ETo were high and relative humidity was low in both years i.e., 2007 and 2008. The weather conditions werefavorable for good growth and development of wheat. Hence, it is concluded that low temperature and low ET during vegetative phase and high temperature, more ET and low relative humidity are favourable for reproductive phase of wheat. Amongst the different empirical methods the Stefan and Stewart method was found most appropriate than others.
