Years of adding acid fertilizer has made your P.H. go south. Your P.H. is probably so low your turf is beginning to die out.
You need a heavy dose of fast acting wet agricultural lime to get your P.H. levels back up!
The Sides Spread-all Spreader is your answer! It mounts to the back of your tractor by way of the 3 point hitch so you can weave between grave sites with no damage and deliver that inexpensive ag. lime to put your soil back to a 6.5 P.H. level.