posted 2 years ago
I’d look to local quarries and other rock processing facilities and ask if they can give you some rock dust they’d otherwise have to pay to move or dispose of. They may well also have a mineral analysis for this. If not, you could send this and soil samples to your state ag extension service. If the profile of the rock dust would generally fit deficiencies in your soil, try it and go from there.
This is all just my opinion based on a flawed memory