Does anyone burn bones? Is it possible to burn bones with wood in a wood stove as a source of fuel and as a means of obtaining phosphorous for soap and for fertilizer? Any good recipes for homemade soap involving lye made from bone ash in addition to wood ash? Would the greywater from such soap make good fertilizer when combined with spent urine? If you get 12kg or nitrogen from urine each year, how much wood and bones would you need to burn for a comparible amount of potassium and phosphorous?