- They comprise about 60 to 80 % of the soil organic matter.
- They are comprised of huge molecules with variable, rather specific, structures and composition.
- They are amorphous, dark colored, partly aromatic, hydrophilic, chemically complexed, molecular weights varying from 2000 to 300,000 g/mol.
- Because of their complexity, they are the organic materials most resistant to microbial attack.
Join the conversation