I rejuvenated some of the soil that we used last year, and used it in our containers, grow bags, and in our straw bales. I had very good results with it, with the exception of one potato and one sweet potato. If you want to see some of the things we produced with the remixed soil, you can take at look at the 5:04 minute mark.
I didn't use any nitrogen with the mix that went in the grow bags, because some the new soil I used had nitrogen in it. In later batches, I added some blood meal to go with the rock phosphate and kelp meal. Overall, I would say that it worked out very well, and I was really pleased with the result.

The Yellow Jersey Sweet Potatoes we grew in the mix: https://youtu.be/YrbeZpdVWQA
The Yucon Gold Potatoes we grew in the mix: https://youtu.be/H1yv3m7bla0

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