Simulation of soil Moisture Under a Line Source in no-tillage System With a Numerical Model

One of the ways for forecasting wetting front and moisture in different points of irrigated soil is to use operational models. Nowadays، according to water resource deficiency، no-tillage system is regarded by many engineers because of its high water applying efficiency. In this study، the performance of HYDRUS-2D has been assessed for a no-tillage system. Hence، in 2007، a field under a corn crop and irrigated with tape in Montpellier، France has been considered and soil moisture at different depths measured by a neutron probe in different depths before and after irrigation in mentioned field for a month and was compared with simulated moisture according to two statistic indexes، i. e. RMSE and EF. Results indicated that the model can simulate satisfactorily soil moisture under no-tillage system، after irrigation by exhibiting that RMSE values are o. o11 and 0. 023 (cm3/cm3) and the efficiency factor of model are 96% and 87% at first and end of simulation period، respectively. Coefficient of determination values were calculated too، being in average 0. 96. All in all، it can be concluded that the performance of HYDRUS-2D in simulating soil moisture under no-tillage is very good; so this model can be used in irrigation management in no-tillage.