Interesting, I have to look more into it. But so far this is what I have found about Bio char

Burning biomass in low-oxygen conditions creates biochar, a carbon-rich substance that some experts tout as the key to soil rejuvenation. Relatively light-weight and porous, biochar can act like a sponge and serve as a habitat for many beneficial soil microorganisms that are known to promote soil and plant health.

It is to bad I dont have a burn pit to make my own to compost, but hey it can be a good excuse to start!

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