On humus formation

@article{Varadachari2005OnHF,
  title={On humus formation},
  author={Chandrika Varadachari and Kunal Ghosh},
  journal={Plant and Soil},
  year={2005},
  volume={77},
  pages={305-313}
}
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… 
View on Springer
36 Citations
Background Citations
10
Results Citations
2

36 Citations

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…
Ligninolytic Enzymes in Environmental Management
TLDR
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.
The contrasting roles of aquatic fungi and oomycetes in the degradation and transformation of polymeric organic matter
Studies on the ecological role of fungi and, to a lesser extent, oomycetes, are receiving increasing attention, mainly due to their participation in the cycling of organic matter in aquatic…
Fungal Decomposition of Natural Aromatic Structures and Xenobiotics: A Review
The review deals with transformation of natural and synthetic aromatic compounds by fungi (causative agents of white rot, brown rot, and soft rot, as well as soil filamentous fungi). Major enzyme…
Effect of biodelignification of rice straw on humification and humus quality by Phanerochaete chrysosporium and Streptomyces badius
Evaluation of “alperujo” composting based on organic matter degradation, humification and compost quality
TLDR
Composting technology can be used as an alternative treatment method to turn AL into compost that can be use as organic amendments or fertilisers for agricultural systems, and demonstrates that composting technology could be used in addition to traditional treatment methods for organic amendments and fertilisers.
Biodelignification and humification of horticultural plant residues by fungi
A study on natural and synthetic humic acids and their complexing ability towards cadmium
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
TLDR
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…
...
...

References

SHOWING 1-10 OF 17 REFERENCES
Some aspects of the biochemistry of humic acid decomposition by fungi
Chemical Composition and Physical Properties of Humic Substances
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…
THE CHEMISTRY AND REACTIONS OF HUMIC SUBSTANCES
Soil Organic Matter
THE MICROBIOLOGICAL DEGRADATION OF AROMATIC COMPOUNDS.
  • 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
...
...