Is it a consistent size? I think the roper size biochar could be good for aeration and last fairly long......for aeration.....plants much longer.
I have a product that I've used on the lawn that is a micronized Humic Acid./Biochar product. made by The Andersons company called HumiChar. I really worked well on the lawn. I didn't use any in this run, but have in the past.