Story: Superphosphate
The basic ingredients of superphosphate are rock phosphate and sulfuric acid. Sulfuric acid is made by converting elemental sulfur to sulfur trioxide, which, with added water, is dissolved in sulfuric acid to produce more acid. Finely ground rock phosphate and sulfuric acid are mixed in a den to produce superphosphate, which is then granulated and dried. Other nutrients may be added at this stage.
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Te Ara - The Encyclopedia of New Zealand
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