humus
humus
1. Decomposed organic matter of soils that are aerobic for part of the year: it is dark brown and amorphous, having lost all trace of the structure and composition of the vegetable and animal matter from which it was derived.
2. A surface organic soil horizon that may be divided into types, e.g. mor (acid and layered) or mull (alkaline and decomposed). It is the ‘histic epipedon. See also HUMIFICATION.
1. Decomposed organic matter of soils that are aerobic for part of the year: it is dark brown and amorphous, having lost all trace of the structure and composition of the vegetable and animal matter from which it was derived.
2. A surface organic soil horizon that may be divided into types, e.g. mor (acid and layered) or mull (alkaline and decomposed). It is the ‘histic epipedon. See also HUMIFICATION.
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