Have been trying to find out the problem with my centipede and have finally come to the conclusion after much reading and research that I have a good case of centipede decline. My yard has been established 3-4 years and is on sandy soil. I have applied 15-0-15 w/ 3% iron already this year. Last year when I started noticing this problem I went out like an idiot and bought 10-10-10 and put a pretty hefty amount. Now that I know what to put and not what to put is there anything I can do to help my lawn? It is not looking real good!!!!! Reside in middle GA. Soil samples show ph around 5.5-5.7!