Originally Posted by Kiril
Soil cores were taken at 8-10 inches with all the organic matter discarded for testing. The results include both the consolidated clay and aggregated clay and I would consider both as A horizon. The compost on top is ~ 1/2" thick on average.
One might make an valid argument to test the two layers independently given the differences, however given this is turf I am not inclined to make that distinction.
The Ca:Mg and pH are a result of inherent properties of the soil and irrigation inputs. Irrigation water runs high in Mg with a pH of 8.3-8.5.
So asides from the compost topdress, what other inputs are you using for this improved clay site?