Topsoil
(i) The surface soil horizon (A) which is modified when cultivated, and designated Ap. See also surface soil. (ii) Fertile soil material used to topdress roadbanks, gardens, and lawns.
(i) The surface soil horizon (A) which is modified when cultivated, and designated Ap. See also surface soil. (ii) Fertile soil material used to topdress roadbanks, gardens, and lawns.