A laboratory experiment was conducted to examine the oxidation of elemental sulphur (Sa) in a red non-calcareous (Typic Haplustalf) soil. Different levels of S° (60 and 100 mesh size) at a rate equivalent to 1000, 5000 and 10000 mg kg were thoroughly mixed with soil and incubated for 120 days at 25°C+2°C. The oxidation was measured by the increase in the concentration of sulphur (SO4-S) in soil. The highest oxidation of 46.3 per cent was achieved when S° was added as finer particles (100 mesh) at a rate of 1000 mg S kg soil. The S' oxidation also resulted marked reduction in soil pH.
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