Study of the moisture and salinity distribution pattern for subsurface drip irrigation in sandy mixed soil using the Hydras 2D program
Keywords:
Saline concentration, Drip system, Subsurface irrigation Emitter, Percolation, Moisture content, Wetting patterns, Hydrus-2D.Abstract
Water scarcity in arid regions makes saline water a valuable alternative source for irrigation. Trickle irrigation is a method that delivers water directly to the soil through an emitter into the root zone of plants. This study investigates the impact of varying amounts of irrigation water from drip emitters on water and salt distribution. It will use a numerical model (Hydrus 2D) to analyze the two-dimensional flow and solute distribution under subsurface irrigation with different drip settings. Irrigation duration and volume directly influenced solute distribution in all soil types. Salinity volume depended on saline content in irrigation water and discharge duration. In the simulation, when plants are irrigated with water that has a salt concentration of 8 ds m-1, the yield of maize crop grown reduction is 100%. If the plants are irrigated only with salt water, the salt concentration decreases by 17.5%. If they are irrigated with salt water and one-time fresh water, concentration decreases by 25%. In this case, a large quantity of fresh water is required to flush out the amassed salt from the soil. However, when the plants are irrigated with water with a salt concentration of 4 ds m-1, the reduction is 25% to 50%. If the plants are irrigated only with salt water, the salt concentration decreases by 15%. If they are irrigated with salt water and one-time fresh water, the salt concentration decreases by 25%. In this case, only a tiny amount of fresh water is needed to leach the salt.
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