Cole... I think if you add some mulch (ie leaves) on top of the black dirt. It will get the earthworms going. It worked in my small plot, along with some egg shells and coffee grounds.
I know you're working a much bigger area.. Old hay would probably work just as well, for mulch. I noticed a dramatic difference in the concrete like soil, just after one year. I've got a 7 blend cover crop on it right now. So we'll see how year 3 tuns out. Best of luck!
-Jimmy
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