Evaluation of Nitrate Dispersivity in Sandy Soil and Simulation by HYDRUS-2D

Chemical fertilizers used in agriculture are sources of environmental pollution. Factors affecting the movement of salt and water in the soil profile help effective management and reduce nitrate leaching from the root zone. In the present study¡ NO3- dispersivity in sandy soil and simulation by hydrus2D has been investigated. In order to perform it¡ 5 different height of soil column 20¡ 40¡ 60¡ 80 and 100 cm (H1-H5) selected. Brigham model was used for calculation of dispersivity and HYDRUS software was used for simulation of NO3 movement. Results of the HYDRUS simulation indicated that the dispersivity of sandy porous media was not dependent on the height. The result of HYDRUS showed that with increase of aquifer length¡ dispersivity increased but it was not significant.