mor (or raw humus)

A nonzoogenous forest humus form distinguished by a matted F layer and a holorganic H layer with a sharp delineation from the A horizon. It is generally acid, having high organic carbon content (52% or more) and a high C:N ratio (25-35, sometimes higher). Various subgroups can be recognized by the morphology, and chemical and biological properties.

mor, humus brut Source: Research Branch, 1976
Contact: Peter Schut