No expertise. If the roots are the problem maybe using a garden rototiller will break them up and spread then out "evenly" over the soil and bring some to the surface so you can pick them up. Them maybe some good top soil and replant.
On a more practical basis I think you want to find someone to test a few soil samples and see if you have some chemicals in the ground that are giving you a problem. The state ag dept maybe able to help.
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