black husk charcoal after burning, rice husk charcoal (biochar) is suitable for planting media mixtures.

abstract agriculture art ash asphalt backdrop background biochar black burning charcoal closeup cobblestone concept dark decor design detail energy environment exterior fertilizer fire floor flooring food frost geology gravel gray grunge husk idea industry ingredient interior iron leaf light macro material media mixtures natural nature object old organic paddy pattern pebble pile plant planting power rice rock rough rubble sand sidewalk soil stonewall studio suitable surface tarmac texture textured tree wall wallpaper white wood