Hello gentlemen, I'm a homeowner who is trying to continually improve my lawn. THe lawn is primarily bermuda with some large patches of St Augustine (which I would like to overrun the bermuda eventually). I'm getting ready to apply my fall fertilizer. I've not had a soil test done, but my soil has a hard clay base, not much loam. Last spring I used 13-13-13 with good results. I'm not sure if this would be OK for fall. Thanks in advance for any advice. Forgot to mention, this application will be done with granular, from a push cart type spreader.