HELP! I cannot grow grass!!!

"But then it evaporates. Peat moss adds no nutrients. And simply laying it on top of the soil does nothing for it's structure. "
Well Duh! Of course water evaporates.. But by the time it's getting dry, the sprinklers should be coming on to water it again. With the peat moss or another appropriate top dressing, you can go a lot longer between waterings. And it's not there for nutrients or to add structure to the soil. It's there to keep the seed partially covered and damp while it germinates. Ever see hydraulic mulch that's used very effectively in commercial hydroseeding? It does exactly the same thing.
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