Appendices - Soil Essentials: Managing Your Farm's Primary Asset - page 156

Appendix 11. The organic matter cycle

Organic matter
(plant, animals + microbes)

Other
compounds

Carbohydrates
+ lignin Proteins

Organic
acids

Plant nutrients
(Ca 2+ ,K - , etc)

H 2 PO 4 - H 2 S

Humus

Amino acids

SO 4 2 -

CO 2 (g)

NH 4 +

HCO 3 - (aq)