Hey, thanks for the replies!
Cuban007, I read the Gardenweb link.
The riding stables from which I collect my manure don't have a lot of pasture available for their horses. These animals are mostly grain-fed. I haven't seen any salt-lick blocks on my visits to these ranches. Next time, I'll ask about salt blocks.
     Would it help if I combined this summer's lawn clippings? (in Florida's rainy season, it's huge!). Plus, I also have numerous large oak trees around my property which drop an enormous amount of leaves every year. If all this stuff (manure, grass clippings, and oak leaves) were combined into the compost pile, would it create something that would carry most of the burden of fertilizing my twenty tropical fruit trees of various types? 
     The reason I'm following this line of questioning is because I lost my job a couple of weeks ago, and will have to cut back on numerous expenses, including fruit tree fertilizer.
     These trees mean a lot to me. Any el-cheapo solutions and suggestions will be considered.

The last time I got fruit on my oldest lychee was the summer of '09. The freeze of January 2010 nearly killed that tree. I had to cut back dead branches until the tree looked like a stump. Since then, the tree has grown back beautifully, and bloomed last January, but all the tiny fruit eventually fell off.
     I have two younger trees that look healthy. All three lychees are now flushing new leaves like crazy. Should I prune all three in the middle of July, even though none of them fruited?

Say puglvr, did you take those photos in my yard? I'm having the exact same problem.
However, in my case I believe the culprit is a coon, because this damage is occurring at night.  I must say my hat's off to those of you who patiently suffer these depredations without resorting to violence. You are definitely more highly evolved beings than I.
    This sort of thing sends me on the warpath, and I don't rest until the varmint(s) responsible "sleeps with the fishes".
    But hey, that's just me, I guess.
     One of the greatest purchases I ever made was that well-worn cage trap out in the garage. It (and my trusty .22 rifle) did their jobs admirably last night. I've only got two mangoes left on the tree, and you can bet that trap will be re-set every night until those fruit are safely harvested.
      By the way, here's the best way I've found to bait a cage trap. Cut off a four-inch length of 2" PVC pipe. Drill a couple of holes in the middle to fit your hanging wire. Put a tiny bit into your drill and drill six to eight little holes all the way around both ends of your bait tube. Tap some of those teensy-tiny 2" nails (I think they're called "brads") into the holes to form sort of a grill, so that the coons can smell the bait, but not reach it.
     Stuff your bait inside, then tap the nails back in place. These nails can be easily loosened and backed out with pliers when re-baiting.
      I hang this contraption from the top of the cage so it dangles above the trigger treadle. The coon has to work so hard getting at the bait that it eventually steps on the treadle.