A Study of Nitrate Uptake of Four Nitrogen Frtilizers and its Movement Simulation in Sandy Loam Soil by Hydrus-1D

In this study, a factorial experiment based on completely in a sandy loam soil under potato cultivation by Hydrus-1D with two factors of nitrogen fertilizer type in 4 levels (Nano- Nitrogen Chelate (NNC), Sulphur Coated Nano- Nitrogen Chelate (SNNC), Sulphur Coated Urea (SCU) and Urea (U)) and nitrogen amount in 3 levels (46, 92 and 138kg-N/ha) was desighned. The results of Freundlich fiting on soil nitrate showed that this model in each three nitrogen levels describes with minimum SSQ NNC and SNNC treatments. The maximum Kdin the 46 kgN/ha belonged to NNC (0.14), in the 96 kgN/ha pertained to NNC (0.17) and in the 138 kgN/ha belonged to NNC and SNNC (0.19). Furthermore, increasing using firtilizer in all treatments led to increasing sorption capacity. The simulation results indicated that the minimum NRMSE=0.07 and maximum R2=0.999 pertained to 138 kgN/ha SNNC. The maximum NRMSE and the minimum R2 belonged to Urea treatment. Overall this study results displayed using nano nitrogen firtilizers leads decreasing nitrate leaching and increasing its keeping in soil.