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Influence of Sorbed Hydroxyl and Sulfate on Liming Efficiency, pH, and Conductivity¹

ABSTRACT

Soils having different values of permanent charge (CECp), variable charge (CECv), and anion-exchange capacity (AEC) were treated with hydroxyl, sulfate and hydrogen saturated exchange resins. The AEC was then principally OH^- or SO₄^2- saturated while CECp was principally saturated with aluminohydronium and CECv with covalently bound H. To these systems were added increments of Ca(OH)₂ and the release of SO₄^2-, Ca²⁺ sorption efficiency, pH, and conductivity measured. Soils containing sorbed SO₄^2- had lower Ca²⁺ sorption efficiency, higher lime requirements, lower pH's and higher specific conductivities than those containing sorbed OH^-. These effects were the result of replacement of sorbed SO₄^2- by OH^- according to the reaction: Soil-SO₄ + Ca(OH)₂ Soil-(OH)₂ + CaSO₄

¹ Contribution from the Soil Science Dept., North Carolina State of the Univ. of North Carolina at Raleigh. Published with the approval of the Director of Research, North Carolina Agr. Exp. Sta. as paper No. 1962 of the Journal Series. Presented before Div. II, Soil Sci. Soc. Am. Meetings, Nov. 28, 1961, St. Louis, Mo.

² Formerly Research Assoc. Professor, Soil Science Dept., N. C. State of the Univ. of North Carolina at Raleigh; now Soil Research Adviser, Scott Agr. Laboratories, Nairobi, Kenya.

Received for publication September 3, 1963. Accepted for publication March 11, 1964.