Matthew Reed wrote:Ah, good advice from both of you. Should I not worry about
the cracked

branch missing bark?

If the leaves extending from the crack look ok, leave it alone.

How about pruning? There are hundreds of little
vertical suckers sticking up all over the top of the tree, should I cut all
or some of them off?

You can cut off all the suckers, preferably while the tree is dormant in
early Spring.
Certainly remove any dead branches. You can also cut off one of every
branch that
crosses closely to another. Cut off branches that grow inwards towards the
trunk.
That should do it.

I will see about the aggy agent, might be of some help.

How would I go about fertilizing it?

You can spread mulch around the drip line and/or mix in some composted
manure.

Also, I'm not sure how to water it. In
the spring the water table is only 9 feet deep. In summer I think it drops
to 18 feet or maybe deeper. I'm not sure how deep the tree roots go.

Apple trees do not send out deep roots and tend to stay near to the surface.
Test the
soil about 6 inches or so deep for signs of moisture. If necessary, deep
water the tree
about once a week.

Sherwin D.