Humic Acids

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Organic Matter Decomposition Degradation of Plant Residues Humus Genera of Microorganisms Capable of Utilising Different Components of Organic Matter Humic Acids Beneficial Role of Humic Acids

Humic Acids

Humic Acids
An understanding of the biochemistry of humus degradation has posed problems mainly due to the procedural difficulties in solvent extraction of organic matter complexes. Further, bio-degradation products of lignin are closely linked with those of humus substances. In spite of these inherent difficulties, fulvic acid, humin and humic acid have been recognised as the three major fractions by subjecting humus complexes to solvent extraction procedures. Fulvic acid is the alkali as well as acid soluble part of soil organic matter and contains carbohydrates and proteins.

Humin is resistant to cold alkali and is a chemically heterogenous fraction. Humic acids form the bulk of the humus complex and are regarded as polymers of aromatic compounds. A wide variety of phenolic degradation products can be obtained from humic acids. Fungi and bacteria are known to decompose humic acids. Some of the fungi, mostly basidiomycetes and ascomycetes, capable of decomposing lignin, can also decompose humic acids.

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Mineralization and Immobilization Process Effects of Residues of Crops on Plant Growth Soil Sickness Composting Vermicomposting Green Manure Anaerobic Decomposition of Organic Matter Biogas Degradation of Hydrocarbons

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