Sulphur Cycle

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Soil Microbiology Nature of Soil Soil Habitats (Lithosphere) Microorganisms in Soil Decomposition of Organic Matter in Soil Bacteria in Soil Physiological Types of Bacteria in Different Soils Fungi in Soil Protozoa in Soil Algae in Soil Viruses in Soil Functions of Microorganisms in Soil Humus Functions of Humus Cycles of Elements Carbon Cycle Nitrogen Cycle

Sulphur Cycle

	Sulphur Cycle - Sulphur is widely distributed in nature and is one of most abundent elements. It is essential to all living organisms because sulphur containing amino acids are always present in almost all types of proteins. It is found both in free as well as in combined stages. In the combined form it occurs in both inorganic and organic combinations.
Cycling of sulphur is similar to that of nitrogen. Transformations between organic and elemental states and between oxidized and reduced states of sulphur are accomplished by various types of microorganisms, specially bacteria.

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Sulphur Cycle Ammonification in Soil Nitrification in Soil Nitrate Reduction in Soil Denitrification in Soil Nitrogen Fixation Symbiotic Nitrogen Fixation Rhizobium Specificity of Bacteria and Legumes Non-Symbiotic Nitrogen Fixation Non-symbiotic Nitrogen Fixing Microorganisms Mechanism of Nitrogen Fixation Oxidation of Sulphur and Sulphur Compounds by Bacteria