in northern macomb county mi. all new housing is being built on very poor clay soil. how effective would spring and fall aeration's and gypsum applications be in promoting overall turf and soil quality. the chem guy's think every lawn needs lime and they sell it over the phone (you know the guy's). what are the rates for appliying gypsum (general figure) and since i'm trying to keep soil compaction to a minimum is a soil reading really needed. merry christmas everybody!