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Old 10-31-2012, 10:58 AM
Cadzilla Cadzilla is offline
LawnSite Senior Member
 
Join Date: Feb 2012
Posts: 664
My simple explanation and understanding is that topsoil is aged compost and the dirt you speak of is subsoil.

The random nature of composted materials is no different than the random makeup and nature of any particular topsoil one would spread so I'm not sure what you mean when you talk about different soils building up over time.

Now I do deal with soil interfacing when sod is used but thats generally because there was no topsoil and it was planted over subsoil causing issues.

The microbial activity is different in composted materials well before they turn into a topsoil type material so in that sense youd probably see benefit from that.
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