The desorption rate of water or 1.0mo/L KNO3 was very low (40%) and the desorption capability of KNO3 to adsorbed SO_4~2- of acidic soils was weaker than that of nearly neutral soils, indicating that acidic soil held and fixed SO_4~2- more firmly.

• 水和1.；0 mol/L KNO_3对土壤吸附态SO_4~(2-)解吸率甚低(<40%25)