How well would tropical fruit trees do if the only fertilizer they got was composted horse manure?
  I've got a big pile of it out back that is more than six months old, and access to more anytime I want it.
    Is there enough essentials, minerals, minors, etc. in composted horse manure to actually use it alone? If so, how much and how often should it be applied?
    Any info would be appreciated.