Richard

A 10-lb bag of Osmocote 14-14-14 is about $20.
$20 / (10 lbs x 14%) ~= $14.30 per lb of Nitrogen.
Apply per fruit tree in the ground or large tub:
1 pint / (2/3 lb x 14%) ~= 11 pints tree per year.
Osmocote is a very good fertilizer, but you can do better for less money.

Rabbit poop is a great supplement. If it is your only source of Nitrogen fertilizer, you will need about 1.75 cubic feet (13 gallons) of composted rabbit manure per tree per year. As inkcube has pointed out, bananas need extra potash and so I would supplement with a source of K as well.

__________________
Back in business at plantsthatproduce.com