Bone phosphate is a compound that is commonly used as a fertilizer and soil amendment. There are several synonyms for bone phosphate, including bone meal, bone flour, bone ash, and bone char. These terms refer to the same product, which is made from ground up animal bones that have been treated with acid to release the phosphorus. Bone phosphate is an important source of phosphorus for plants, which is essential for healthy growth and development. In addition to its use as a fertilizer, bone phosphate is also used in the production of some animal feeds and as a source of phosphorus for some industrial processes.