In reference to Nathan's comments, thank you for being succinct within this discussion. I use lump charcoal and I crush it with a large tamper of the variety use to compact paving substrate (you can get this at Home Depot/Menards/Loews, etc. not expensive and handy to have for many reasons). After crushing one large bag I simply add it in multiple doses to my compost bin. the result is inoculated biochar/compost that is perfect for amending soil. i usually ad it to the compost as I add my green material to be composted in equal volumes. i keep a bucket of the crushed lump charcoal next to the compost bin to keep it handy for addition. This also has the added benefit of locking a lot of the compost nutrients in the charcoal until I'm ready to spread the compost.
