Retrieving "Soil Organic Matter" from the archives

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1. Humus

   Linked via "soil organic matter"

   Chemical Fractions of Humus
   Humic substances are typically fractionated operationally based on their solubility in acids and bases. While these fractions do not represent discrete chemical compounds, they provide a standard metric for characterizing soil organic matter quality.
   | Fraction | Solubility Characteristics | Dominant Chemical Nature (Conceptual) | Average Carbon Content (%) |