Phosphorus Sorption in Soils and Clay Fractions Developed from Different Parent Rocks in Limpopo Province, South Africa

Phosphorus (P) sorption dynamics in soils have implications for the environment and soil fertility. Soils clay fractions that were developed from basalt, granite, arkosic sandstone, gneiss Limpopo Province, South Africa analysed their P adsorption characteristics external phosphorus requirements (EPR). The relationship between parameters EPR of also assessed. Langmuir isotherms gave a better fit with slightly higher R-square values relative to Freundlich isotherms. maxima 285.71 833.33 mg/kg 238.09 625.0 fractions, respectively, ranged 7.78 92.91 mgP/kg 5.13 65.85 respectively. variations suggest single, uniform fertiliser application could cause under-fertilisation over-fertilisation problems. others, showed no risk water quality region at current rate application. statistically significant differences. Hence, be reliable predictors buffering respective soils.