Effects of Residues of Crops on Plant Growth

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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

Effects of Residues of Crops on Plant Growth

Effects of Residues of Crops on Plant Growth
The decomposition products of plant residues in soil may become toxic to growth of plants under certain conditions. The absence of satisfactory extraction procedures and bio-assay methods have come in the way of identifying the nature and extent of phytotoxic principles produced by plant remains which undergo decomposition. However, detrimental effects of plant residues have been detected through seed germination tests, growth of radicles and seedling injury under laboratory conditions which have been supported by field observations like stunted overall growth of plants, chlorosis, slow maturation, premature leaf abscising and failure of flowering and seed setting.

The oxygen status of the soil (aerobic or anaerobic) is the most important factor in determining the qualitative and quantitative aspects of microbially mediated bio-degradation of plant remains. Some of the phytotoxic compounds detected so far include methane, acetic, lactic, butyric, formic and other organic acids; phenolic compounds including syringaldehyde, vanillin, p-hydroxybenzaldehyde, ferulic, syringic, vanillic, p-hydroxybenzoic, p-methoxybenzoic and benzoic acids, various amino acids and many other unidentified products. These products seem to accumulate under waterlogged anaerobic surroundings whereas under normal arable soils the presence of toxic compounds is either rare or negligible.

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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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