Last year I had a soil sampling rendered for my lawn. I think it consists primarily of centipede, though here in my community seed specific planting of lawns isn't a common practice. The sample returned from Clemson Extension services suggested a sever deficiency in phosphorus. It recommends I use a super triple phosphate (0-45-0) per yada, yada. Just recently I purchased enough fertilizer for my lawn it's contents: 18-24-6. I figured it would be okay. After visiting purchased fertilizer products' homepage, they suggested not using a fertilizer containing phosphorus on centipede lawns as it will deplete iron. Could I just use the product and also supplement with iron application? Any suggestions, advice or "know how" will greatly be appreciated.