I have a 3500 sq. ft area to be renovated. I am going to roundup complete area, remove dead grass, till, amend, till, amend and grade and hopefully be ready to plant come Sept. 1 or 15th at the latest. My question is I read a article years ago when Kansas City Chiefs switched from artificial turf to real grass. The exact soil structure was very specific for optimum turf growth. I haven't been able to get a specific formula for soil amending. I have checked the internet, magazines and every other source I a can think of and nothing specific. All info says to amend after soil test, which I understand, but in past when I used soil test, it mostly listed minerals. I guess what I am looking for is sand, compost (what kind), manure any of these things. Also has anybody used the water cyrstals that absorb approx ( 200%) of their weight and slowly release water to soil? Any ideas would be greatly appreciated. Thanks bluemoon ps. soil is mostly (all clay).