North Country Organics, Bone Char (0-16-0, 32% P₂O₅, approx. 30% Ca) Burned bone meal provides large amounts of readily available phosphorus. The most economical source of P for deficient soils (besides fresh manure). May be applied without restrictions to organically certified fields.(0-16-0, 32% P₂O₅, approx. 30% Ca) Burned bone meal provides large amounts of readily available phosphorus. The most economical source of P for deficient soils (besides fresh manure). May be applied without restrictions to organically certified fields.