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Phosphorus Acid
Phosphoric acid (H3PO4) should not be confused with phosphorus acid (H3PO3). A single letter difference in the name of chemical compound can make a difference in its properties. Phosphorus acid releases the phosphonate ion (HPO3), also called phosphate, upon disassociation. Like phosphate, phosphonate is easily taken up and called translocated inside the plant. Phosphorus acid and its related compounds are often referred to as phosphonate, phosphate, and phosphonic acid. One of the breakdown products of fosetyl-Al is mono-ethyl phosphonite, which may be taken up by the plant. Inside the plant, fosetyl-Al may ionize into phosphonate, and therefore fosetyl-Al belongs to the same group of phosphorous acid
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