Humus | Organic matter, Nutrients, Carbon | Britannica
https://www.britannica.com/science/humus-soil-component
WEBMar 31, 2024 · humus, nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances. Humus, which ranges in colour from brown to black, consists of about 60 percent carbon, 6 percent nitrogen, and smaller amounts of phosphorus and sulfur.
DA: 100 PA: 17 MOZ Rank: 15