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The Release of Sulfate from Soil-Applied Basaluminite and Alunite¹

ABSTRACT

Release of SO₄ from synthetic basaluminite and alunite was measured by plant uptake after mixing various rates of these compounds with Marvyn loamy sand at pH 6.5. The fraction of SO₄ released from basaluminite was about one-half that from gypsum, according to S uptake by cotton plants. Alunite released very little SO₄. Release of SO₄ by basaluminite in soil supports the thesis that SO₄ retention and desorption in acid soils can be explained in part by solubility of Al-hydroxysulfates.

¹ Contribution from Department of Agronomy and Soils, Auburn Univ., Auburn, AL 36830.

² Research Assistant and Professor of Soils, respectively.

Received for publication August 28, 1978. Accepted for publication September 18, 1978.