Definition of subsoil in English:

subsoil

noun

  • [mass noun] The soil lying immediately under the surface soil.

    • ‘Heavy clay subsoil or sandy soil with low fertility must be improved if roses are to be grown successfully in them.’
    • ‘Wetland creation attempts are often initiated by the removal of upland surface soil materials exposing mineral subsoil strata.’
    • ‘Soil and subsoil will be stocked for subsequent respreading.’
    • ‘These soils are moderately deep to deep, well-drained loam or silt loam surface soils with loam or silty clay loam subsoils, formed primarily in sandstone residuum.’
    • ‘When digging out the bed, discard any heavy, tight subsoil and save the topsoil.’

verb

[WITH OBJECT]
  • Plough (land) so as to cut into the subsoil.

    ‘to gain maximum benefit from subsoiling this operation needs to be done when the lower levels of the soil are relatively dry’
    • ‘Studies in the past showed that subsoiling clay soil in the spring does not improve cotton harvests.’

Pronunciation:

subsoil

/ˈsʌbsɔɪl/