1. Froth flotation is used to concentrate the mined phosphorus to rock phosphate . 2. Many agricultural systems depend on supplies of inorganic fertiliser, which use rock phosphate . 3. Superphosphate : Rock phosphate treated with sulfuric acid to speed release. 4. The largest deposits of rock phosphate in the country are found in Florida. 5. An initial application of rock phosphate has kept the system going for many years. 6. Factors Determining Rock Phosphate Solubilization By Microorganisms Isolated From Soil. 7. A lease to mine rock phosphate on the islands was obtained by Charles Broadhurst in 1884. 8. Phosphorus in rock phosphate mineral is mostly in the form of tricalcium phosphate, which is water-insoluble. 9. Recently the term peak phosphorus has been coined, due to the limited occurrence of rock phosphate in the world. 10. Synthetic nitrogen, along with mined rock phosphate , pesticides and mechanization, have greatly increased crop yields in the early 20th century.
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