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Fig. 3. Percentage of sorbed NH₄⁺ desorbed from NH₄⁺–saturated Kennebec and Haynie soils after 2-h extraction with 0.01 M CaCl₂ solution. NH₄⁺ was initially sorbed onto the two soils by equilibrating them with the liquid swine waste (black bar) and the (NH₄)₂SO₄ solutions (white bar) both containing 1075 mg NH₄⁺–N L^–1 for 72 h. Different letters indicate statistically significant difference (p < 0.05).