Fig. 5. Phosphorus adsorption on long-term poultry litter-amended soils. (a) Evesboro sandy loam (Ev); (b) Sassafras sandy loam (Sf); (c) Osier loamy sand (Os); and (d) Pocomoke loamy sand (Pm) as a function of pH and initial P concentrations (0.1–1.0 mM).