I haven't worked with biochar yet. My take on it from a soil food web perspective is that it would be best if soaked in compost extract before applying. Use it to deliver lots of good organisms to the soil in a protective structure they can operate from. Almost like innoculating grain spawn with spores. Innoculating soil with biology, including spores.
Discussion
It absolutely has to be charged otherwise itβll steal fertility from the soil for the first couple of seasons.
π― needs to either be soaked or incorporated with compost for an extended period of time to ensure it's loaded with nutrients and microorganisms. I'm going to be mixing it with my compost and giving it a Korean natural farming indigenous microorganism bath.