The effect of flue‐gas desulfurization gypsum (FGDG) on soil physical and chemical characteristics which influence leaching of nitrate (NO3‐) was investigated. Effects of FGDG amendment at 0, 4.5 and 9.0 Mg ha‐1on transport of nitrate (NO3‐), ammonium (NH4+), and bromide (Br) in a Candler fine sand were investigated in a leaching column experiment, with N application equivalent to 180 kg N ha‐1, as either calcium nitrate (CN) or ammonium nitrate (AN). The columns were leached with 2860 mL of water, equivalent to 65 cm rainfall. Cumulative amount of NO3‐N in 2860 mL leachate accounted for 61 and 72% of the total NO3‐N applied as CN and AN, respectively. Application of gypsum at 4.5 Mg ha‐1decreased the leaching of NO3‐from AN by 22% as compared to that without the application of gypsum. Total‐N recovery with or without FGDG accounted for 62 to 67% and 69 to 78% of total N applied as CN and AN, respectively.