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Fig. 1. Changes of sorption of NH4+ in Kennebec and Haynie soils with time. The two soils were exposed to the liquid swine waste (closed symbols) and the (NH4)2SO4 solutions (open symbols) at a soil/solution ratio of 1:10. The measured pH values of the liquid swine waste–soil mixture were 8.0 and 8.2 for Kennebec and Haynie soils, respectively. The pHs of the (NH4)2SO4–soil mixtures were adjusted to the same values as that of the corresponding waste-soil mixtures. Both solutions initially contained 495 mg NH4+–N L–1.
