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Ammonium Phosphate (NH4)
Ammonium Phosphate ((NH4)3PO4). A salt formed by the neutralization of phosphoric acid (H3PO4) with ammonium hydroxide (NH4OH). It is used extensively in fertilizer formulations and finds some limited applications in yeast foods (q.v.) as a ready source of phosphorus and nitrogen (q.v.), two nutrients essential for optimum yeast activity.