To add organic matter you could topdress with 1/4" compost after core aeration.
You should find this site helpful about the pH preferences of turf grasses.
http://www.turf.uiuc.edu/turfSpecies...gement/pH.html
Newt
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When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.
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