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