Abstract
A general model consisting of three submodels for daily rainfall generation, daily evapotranspiration estimation, and daily water balance computation, respectively, was developed in this study for the assessment of rainfed agriculture in Thailand. It can be used to obtain the information on important factors related to rainfed agriculture such as the number of stress days with their frequency and period of occurrence, the amount of supplementary water requirement and drainage requirement. Through simulation runs made by shifting assumed planting dates, one may arrive at the most suitable planting period for each crop.
