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… 
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