Definition of subsoil in English:

subsoil

Syllabification: sub·soil
Pronunciation: /ˈsəbˌsoil
 
/

noun

The soil lying immediately under the surface soil.
More example sentences
  • 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) Back to top  
Plow (land) so as to cut into the subsoil.
More example sentences
  • Studies in the past showed that subsoiling clay soil in the spring does not improve cotton harvests.

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