Definitions for "Solum"
The upper part of a soil profile, above the C horizon, in which the processes of soil formation are active. The solum in soil consists of the A, E, and B horizons. Generally, the characteristics of the material in these horizons are unlike those of the underlying material. The living roots and plant and animal activities are largely confined to the solum.
upper horizons of a soil in which the parent material has been modified and in which most plant roots are contained. It usually consists of A- and B-horizons.
The upper part of a soil profile above the parent material in which current processes of soil formation are active. This is where the living roots and other plant and animal life characteristics are exhibited.
Keywords:  coelo, usque, centrum, tenement, scots
Scots building term for the bare earth area located immediately below the building.
A solum is an area of ground upon which buildings have been constructed. An owner of a building will also own the solum, unless there is provision to the contrary, but not necessarily the mineral rights. See also " a coelo usque ad centrum". In cases of blocks of flats, the owner of the ground floor flat owns the solum. However, unless there is specific provision to the contrary in the titles, the solum is designated as part of "scheme property" under the Tenements (Scotland) Act 2004, for the purposes of liability for maintenance, so that all of the owners of flats in the tenement will have to bear a share of maintenance, regardless of ownership. Frequently the titles to all of the flats provide that the solum, in addition to various other common parts of a tenement such as the roof, is owned by all the proprietors.