I live in Northern Illinois and I want my yard to be perfect, I can water it as much as needed, and I don't mind mowing every other day. My question is-would one pound of actual nitrogen (slow release) per thousand square feet be excessive? My soil tests are fine, perfect actually. Would more than a pound of actual nitrogen be better? I don't always see the really deep dark green lush foliage that I am looking for. The lawn is 100% blue grass. Thanks.