01 n. The bed, or stratum, of earth which lies immediately beneath the surface soil.
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1.
The bed, or stratum, of earth which lies immediately beneath the surface soil.
Phrases & compounds
Subsoil plow —
a plow having a share and standard but no moldboard. It follows in the furrow made by an ordinary plow, and loosens the soil to an additional depth without bringing it to the surface.