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Published in Soil Sci Soc Am J 37:367-371 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chemical Properties of Acid-Sulfate Soils Recently Reclaimed from Florida Marshland1

D. V. Calvert and H. W. Ford2

ABSTRACT

Acid soil layers, with pH as low as 3.0, were found in the subsurface horizons of soils derived from marine sediments and have been recently developed into citrus groves. Soil layers with acidity varying from pH 3.0 to 7.7 and sulfate content from 0.5 to 39.0 meq/100 g of soil were compared for their capability of producing acid-sulfates. Lime requirements of selected acid layers were found to be as high as 4.5 meq of CaCO3 equivalent per 100 g of soil. The acid-sulfate potential (oxidation of reduced sulfur to H2SO4) accounts for the reduction of pH of the reclaimed soils. The sulfate content of soil layers was often in excess of 2,000 ppm when the soil pH after oxidation with H2O2 was below 3.0 and was dependent on oxidizable sulfur content of the sample and buffering capacity of the soil. Oxidized soil layers with pH values below 3.5 released soluble Al and Fe up to 275 ppm and 100 ppm, respectively.

NOTES

1 Contribution from the Univ. of Florida Agr. Res. Center (Citrus Division), Fort Pierce and the Agr. Res. and Education Center, Lake Alfred, Florida. Florida Agr. Exp. Sta. Journal Series no. 4513. Presented before Div. S-2, Soil Science Society of America, Aug. 26, 1970, in Tucson, Ariz.

2 Associate Soil Chemist and Horticulturist, respectively.

Received for publication July 31, 1972. Accepted for publication January 26, 1973.






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