Index >> Microbes and Lithosphere >> Chemical Composition of Soil Humus

Soil Humus
Soil humus is a mixture of dark, colloidal organic compounds relatively resistant to decomposition. These compounds result from the decay of organic litter and accumulate in the o and A horizons of soils. Humus includes sugar amines, nucleic acids, phospholipids, vitamins, sulpholipids, polysaccharides and many other unclassified compounds.