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Dihydrogen phosphate

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A polyatomic ion consisting of two hydrogens and a phosphate group (PO4).


Plants take up phosphorus in the soil typically in the form of dihydrogen phosphate. When the soil is basic ( pH is about <6.0) the ion combines with magnesium in the soil which the plant roots take up. When acidic, the ion combines with iron, which the plant can readily absorb.

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