I went to buy a 50 lb bag of 19-19-19 at the farm supply store the other day, and it felt like I was buying contraband fresh off the boat from Colombia. Had to ask for it by name, go in the back room, and promise the guy I wans't using it on my lawn before he would sell it to me... apparently it's illegal here to broadcast ferts containing phosphorous on lawns. Looked into it a little further and the exception was if you're starting a new lawn from scratch, or can prove to the state of NY via repeated soil tests that you're below a certain threshold of P. Pretty intense.