Abstract

This paper reviews briefly the forms of sulphur in soils and discusses the factors affecting the oxidation of this sulphur to other oxidation states. This oxidation is believed to be carried out mainly be micro-organisms but in many cases strictly chemical reactions are involved. Invironmental factors such as temperature, moisture, and pH, as well as microbial population and particle size influence the rate of sulphur oxidation in soil. Plants normally absorb sulphur in the form of sulphate, and thus the oxidation of sulphide, elemental sulphur and organic sulphur is of prime importance in plant nutrition.

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