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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site humus The organic component of soil, decomposed plant and animal material. Dark brown to black, humus is intimately mixed with the inorganic soil particles. Mainly for its good carbon, nitrogen, phosphorus, and sulfur content, it is of great agricultural importance. Related categories    • AGRICULTURE    • HORTICULTURE    • ECOLOGY AND THE ENVIRONMENT Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP