The top two soil layers, composed of the topsoil (A-Horizon) and the subsoil (B-Horizon, or layer of leached material deposition). The solum excludes the parent material layer (C-Horizon). Also referred to as the Zone of Eluviation. Also see Soil Profile.
SOLUM
Meaning of SOLUM in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012