peat adds NO NUTRIENTS...it actually absorbs the nutrients in the soil and any fertilizer you add.... proponents claim that then it releases these slowly.... (maybe so, but not when on the soil surface, as up there, it's not being affected by the osmosis that the roots of plants get set up for water movement.... and, the drying effect of sun and wind on the surface would have it pulling water from AROUND the little grass seeds....)....... where it comes from, the bogs, it's actions create an acidic, nutrient poor water that is as sour as straight vinegar!....
it is touted to be great in it's water-holding.... yeah, IF you can get it wet to start with.... and keep it that way.... here, in our clay soil, the clay coats each little strand and renders it useless for water holding if it ever dries out.... peat and clay make bricks in a drought like we've been having.... compost is the choice here...
... it's a non-renewable resource.... the peat bogs that it's taken from are now releasing methane which isn't so good for the planet's warming problems.....
straw is a natural cover, since it's grass, too... it hides the seed pretty good from the birds... it does break down quickly, but then, you did add a starter fertilizer so the nitrogen thing is moot....
peat is available, it's just that folks are seeing it as a no-no these days and rightly so....