The soil lying immediately under the surface soil.
- Wetland creation attempts are often initiated by the removal of upland surface soil materials exposing mineral subsoil strata.
- Heavy clay subsoil or sandy soil with low fertility must be improved if roses are to be grown successfully in them.
- When digging out the bed, discard any heavy, tight subsoil and save the topsoil.
verb[with object] (usually as noun subsoiling)
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