did you add extra perlite to the mix? it'll need good drainage, and not stay wet for too long.

i fertilize about half strength every month from about march through september.

you'll want to prune any new branches that come out from the lower 6" of the trunk, those are usually suckers from the rootstock. your tree will be bushy for a while, unless you get one of those fast growing water spouts that can grow straight up 3-4' in about 2 months time.

I never prune my Meyers, but I want as heavy a crop as possible. In a good year I'll get 75+lb. from my oldest, which is about 17 yrs old now.

Improved Meyers ARE a bush. They have criss-crossing branches and a naturally 'heavy' appearance. Even grafted on tree stock (2 of my 3 plants are purchased plants of this type) it will grow more quickly wide than it does tall.

You can get an idea of what older IM's look like in the photos I posted for Johnmerr on Dec. 24th, a little ways down the discussion thread I started over in the Cottage Gardening forum titled "The Meyers are starting". Mine are just starting to mature at about 10 yrs old for the trees and 17 yrs old for the bush. The trees were planted in 2003 but they were 5-gallon containers so I estimate they were about 2 yrs old when they went into the ground.

Here is a link that might be useful: 3 Meyers: 1 bush, 2 trees