Fig. 5. (a) Ammonium sorption and (b) desorption in Kennebec (closed symbol) and Haynie (open symbol) soils exposed to the modified swine waste solutions containing varying dissolved organic C concentrations (circle symbols) and (NH₄)₂SO₄ solutions (square symbols) for 24 h. The initial NH₄⁺ concentration of all the solutions was 250 mg NH₄⁺–N L^–1. The pH and the concentrations of all the major cations and anions in the solutions matched that of the liquid swine waste shown in Table 2.