+1 for G.R.I.T.S recomendations. Especially the Lesco 8-2-12.
Be aware the new areas have a sand base with less than 6" clay + soil and then sod on top so make sure you're not getting a lot run-off with longer watering cycles.
You may need to break watering up into several shorter cycles with time inbetween to let the water soak in.
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