On humus formation

  title={On humus formation},
  author={Chandrika Varadachari and Kunal Ghosh},
  journal={Plant and Soil},
SummaryA scheme on humus formation has been proposed. This is as follows: Lignin/carbohydrates, the chief sources of C for the microorganisms are first broken down by extracellular enzymes into smaller units. Soluble units are absorbed into the microbial cell where part of them are converted to phenols/quinones. These together with oxidising enzymes are discharged into the environment where they polymerise by a free radical mechanism. The formation of FA (fulvic acids) has also been explained… 
Sorption capacity of lignocellulosic materials toward humic acids
Sorption capacity toward humic acids was studied for a number of lignocellulosic materials with different structures and chemical compositions. The values of sorption capacity of the materials toward
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By producing lignocellulose-degrading enzymes, saprotrophic litter-decomposing Basidiomycetes can significantly contribute to the turnover of soil organic matter and help in converting the waste litter into value-added compost.
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The natural and synthetic humic acids were characterised by potentiometric titrations, viscosity and surface tension measurements, as well as visible spectometry The results have been correlated with
Isolation and characterization of a micromycete, a producer of neutral catechol oxidases, from tropical soils with elevated dioxine content
Samples of South Vietnamese soils intensely treated with Agent Orange defoliant were tested for the presence of fungi and actinomycetes with an elevated phenol oxidase activity and identified as Mycelia sterilia INBI2-26, a fast-growing nonsporulating strain producing neutral Phenol oxidases, thus indicating the enzyme to be a member of the laccase family.
The role of laccase in stabilization of soil organic matter by iron in various plant-dominated peatlands: degradation or sequestration?
The association of organic matter with iron (Fe-OM associations) is recognized as an important stabilization mechanism for soil organic matter. Our objective was to assess the factors regulating


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The processes of humification occur mainly under aerobic conditions. Animals that live in the soil may initially reduce the size of the fresh organic residues. Further transformations are promoted by
Cleavage of humic acids bypenicillium frequentans
SummaryFunctional group content of undegraded humic acids was compared with that of humic acids which had been partially degraded by a strain ofPenicillium frequentans. It was found that cleavage of
Information Provided on Humic Substances by E4/E6 Ratios1
The ratio of optical densities or absorbances of dilute, aqueous humic and fulvic acid solutions at 465 and 665 nm (E4/E6) is widely used by soil scientists for the characterization of these
Micromorphology of Soil Organic Matter
Natural humus formations look very different morphologically to the naked eye. These differences provide the basis for a division into groups, which are called humus forms. The morphology of humus
Soil Organic Matter
  • W. Evans
  • Biology
    Journal of general microbiology
  • 1963
Microbial utilization of soil humic acids.
Soil organisms capable of growth on humates were isolated by direct plating and enrichment culture techniques. A strain of Penicillium frequentans, which was selected for further studies, utilized
Biochemical aspects of oxidative coupling of phenols
  • Oxidative coupling of Phenols
  • 1967