Modeling Soil Profile Salinity with HYDRUS-1D

Salt accumulation within the root zone significantly effects plant growth and development in arid semi-arid regions. Today, use of low-quality irrigation water agricultural production is increasing rapidly, because continuous depletion pollution resources. This means more salt transferred to soil profile. It great importance predetermine practices for sustainable crop production. For this purpose, models tools that can produce reliable fast results should be used. In study, profile salinity was modeled with HYDRUS-1D software. present Three different levels (S1=0.25 – control/municipal tap water, S2=1.5, S3=3.0 dS m-1) 4 volumes (leaching ratio) (LR1=10%, LR2= 20%, LR3=35%, LR4=50%) were a randomized plots factorial experimental design 3 replications. Each treatment carried out individual PVC lysimeters length 115 cm diameter 40 open-field determine efficiency model at leaching rates. Alfalfa (Medicago sativa L.) preferred as due its economic value, effective depth being perennial plant. During growing period, total 7 irrigations practiced five samples taken from 20, 40, 60, 80 100 depths last day each month. Present findings revealed values software sufficient salinity. Relative error (RE) ranged 0.048 0.307. Increase applications reduced accuracy model. However, it said produced by even under mentioned conditions. Especially academic studies, used obtain results.