I am a commercial mower (my motto is "I don't know, I just mow"). I wanted my own yard to look good, so I started experimenting with different fertilizers. About a month ago I put down 40 lbs of 12-12-12 and about 20 lbs of urea (46-0-0) and watered the living daylights out of it. (I have 15,000 sq ft of grass.) Now I have the nicest lawn in Millbury, but I have to mow it every other day. A guy asked me what I use on it, and when I told him, he said I was going to get shallow root growth and was asking for trouble. I'm not looking to horn in on someone else's turf (haha)... I've got enough to keep me busy with just mowing. Am I hurting my yard applying this mixture?