urea and super phosphate are called
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Urea superphosphate is made from urea, which is a cheap source of nitrogen, and from phosphate rock as a cheap source of P2O5. The powder or granules of urea superphosphate can be used as fertilizer.
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Superphosphate is the first chemical fertilizer. It was first made in about 1840 from bonemeal and sulfuric acid. Shortly later, superphosphate was made from rock phosphate ore by treatment with sulfuric acid. This material is called ordinary superphosphate or single superphosphate and is 0-20-0-11S. Rock phosphate treated with phosphoric acid produces triple superphosphate or concentrated superphosphate with a grade of 0-46-0 with no sulfur.
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