SULFUR OXIDATION IN FOUR SOILS AS INFLUENCED BY SOIL MOISTURE TENSION AND SULFUR BACTERIA

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Abstract
Four soils of widely different moisture retention characteristics were adjusted to various soil moisture tension values after adding elemental S, and sulfate production was studied over a 12-week period. Three soils oxidized S most rapidly at a tension of 30 cm. of water; the other at 60 cm. Oxidation decreased with increases or decreases in the moisture tension values. Bacterial studies showed Thiobacillus thiooxidans. present in soil producing greatest oxidation and absent in a low oxidizing soil.