What are the raw materials for preparing biochar?

Corn straw, wheat straw, rice straw, peanut straw, soybean straw, sorghum straw, cotton straw, reed straw, calamus, rice straw, wood flour, peanut shell, fruit shell, rice husk, walnut shell, rubber shell, bagasse, red residue, bean dregs, pine needles, pine cones, apple branches, pear branches, etc.