Significance of Biological Sulfate Reduction in Soil Salinity
1965
Ogata, G. | Bower, C. A.
The effect of native and applied organic matter (straw) on sulfate reduction under anaerobic conditions in arid-zone soils was studied in the laboratory. Changes in the composition of dissolved and adsorbed ions as a consequence of SO₄ reduction was also studied. The results indicate that SO₄-reducing microorganisms are generally present in arid-zone soils. Appreciable reduction of any SO₄ present does not occur when arid-zone soils become anaerobic by waterlogging, however, unless undecomposed organic matter (plant residue) is present or the soil organic matter content is high (e.g., > 5%). Sulfate reduction results in the formation of equivalent amounts of carbonates which, upon reaction with soluble or exchangeable Ca and precipitation as CaCO₃, cause decreases in soil salinity and increases in the exchangeable sodium percentage.
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