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Fig. 6. Ammonium sorption in Kennebec and Haynie soils exposed to the swine waste and the (NH4)2SO4 solutions at pH 4.0, 6.0, and 8.0 for 24 h. The initial NH4+ concentration of the solutions was 250 mg NH4+N L1. Different letters within each bar group indicate statistically significant difference (p < 0.05).
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