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Sulfuric Acid as an Amendment for Reclaiming Soils High in Boron¹

ABSTRACT

Laboratory results indicated that sulfuric acid can effectively aid in reclaiming soils high in boron. Results of a study, using 80-cm columns of a soil high in B, indicated that a surface application of 3.22 metric tons/ha of concentrated (96%) H₂SO₄ followed by leaching with 3 pore volumes, p.v. of water was nearly as effective in reducing the level of water-soluble soil B as was leaching with 16 p.v. of water. A direct pH effect on B adsorption affinity can explain the enhanced reclamation effect at the soil surface but cannot account for the beneficial effect found at lower soil column depths. Data suggested that competition by silicate ion for adsorption sites may be contributing to the enhanced desorption of B at lower soil depths.

¹ Contribution from the USDA ARS, U.S. Salinity Lab., Riverside, CA 92502.

² Soil Scientist. U.S. Salinity Laboratory, P. O. Box 672, Riverside, CA 92502.

Received for publication March 18, 1977. Accepted for publication July 27, 1977.