Course Content
Learn soil fertility, fertilizers and integrated nutrient management with Braimy- B.SC Agriculture
About Lesson
  • 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.
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