A lite version of the Soil Moisture Water Balance Model (SMWBM) that is specifically designed for paddock scale irrigation scheduling analysis.  The model utilises the same pameters as the full SMWBM, with additional parameters that define the irrigation scheduling rules, application rates and crop factor.  The model has a built in optimiser for automatically determining the most efficient irrigation application rate.  This is defined as the peak application rate that meets the irrigation criteria and maintains soil moisture levels above the plants wilting point, while minimising water usage and hence water losses to the environment.