I always keep a ratio OF the collection soil.. (I err on the side of cautious collection, these days)... Mixed with my standard, in-organic GROWTH mix.
I try to, essentially, shock the specimen as LITTLE as possible (trying to BARELY disturb fine "shin" roots) during collection and let it recover as MUCH as possible (this means leaving it the heck alone) the following growth season..
However.. if said tree exhibits INCREDIBLE health and vigor by mid-season.. I will
do some light-moderate work..
All the "heavy stuff" happens AFTER its "rebound season"..
I've killed a few trees operating... differently.
I DO know that blueberries have neat, specific fertilizer "likes".
@Leo in N E Illinois has Blueberry Fert (Or other acid-loving/balanced) blends that (I'm thinking) he was either INTEGRAL in the creation of, or SOLE creator of. (Not sure, we'll find out soon).. Seriously, though, If you are "into" horticulture... JUST how the nutrients are SOURCED in these blends will excite you. I believe they are used at UM.. but I can't remember.. exactly.
He has been known to offer these blends to us fine folk, at reasonable price...