6. Fuel for composting
Anything that is derived from once-living matter is suitable fuel (see list in next section).
The bacteria that rot down the material need a nitrogen supply too, which can be provided by soft sappy material such as mowings or leaves of comfrey or nettle. Animal manures and urine also supply nitrogen, as do commercial compost makers or a nitrogen fertiliser (use sparingly after each 15cm (6 inch) thick layer).
