Application of Hydrus-2D for simulation of water distribution in different types of soils

Abstract

Study of water distribution in the soil as a result of water application involves simulation of water movement in porous media. Water distribution in the soil depends on the hydraulic properties of the soil. In the present study, water distribution in the root zone depth of the green pepper was simulated at various emitter discharges under different fertigation strategies for various types of soils. A two-dimensional water and solute transport model Hydrus-2D was selected for the simulation. Experiments were conducted with the research farm of Bastam Agricultural Center, Shahrood, Iran to investigate the water distribution pattern under different types of soils. Investigation of water distribution in soil was done in seven types of soils. For simulation of water movement in soil Hydrus-2D was calibrated and validated. Results of simulation indicated that for all the soils, water content was more in first layer of soil. Irrigation cycle was 48 hrs and adequate water content was available in the active root zone of the green pepper. Another result of this study showed that if the drip fertigation system designs properly, it will reduce drainage water below the crop root zone. Final result of simulation showed that in all types of soils amount of percolation from drainage boundary was less than one percent of applied water.