Topsoil means soil which is with the A-1 horizon of a soil profile, containing organic matter, nutrients, and the microorganisms necessary for normal plant growth.
(Topsoil; means; soil which is with the A-1 horizon of a soil profile,) (soil; is; with the A-1 horizon of a soil profile) (a soil profile; containing; organic matter, nutrients, and the microorganisms necessary for normal plant growth)
Topsoil soil a soil profile
means is containing
soil which is with the A-1 horizon of a soil profile,
with the A-1 horizon of a soil profile
organic matter, nutrients, and the microorganisms necessary for normal plant growth