Topdressing or aeration--which is better? Are they really the same? Which one is quicker? Not sure if this is right. I calculated that a 3/4" tine aeration hole is about .44 square inch. at 3 inches deep that is 1.32 cubic inches per core At 16 holes per sqft, that is 21.12 cu in per sqft Dividing by 144, that is a layer of soil of about .15 inch If 32 holes per sqft... I would have .30 inch of soil layer (if spread evenly). And no shoveling is needed. Is core aeration similar to topdressing? Your thoughts?