| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| bone meal |
| finely ground bone used as a fertilizer for its content of phosphate and nitrogen (about 23%–30% available phosphate and 2%–4% nitrogen); it is an expensive form of phosphoric acid when compared with superphosphates. Bone meal is also fed to farm animals to supply needed mineral food constituents, e.g., calcium and phosphorus. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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