How does ammonium phosphate supply more than one plant nutrient?

Ammonium phosphate supplies more than one plant nutrient because it is a chemical compound that combines two essential elements required for plant growth: nitrogen and phosphorus.12

In plant nutrition, nitrogen and phosphorus are classified as macroelements, which are nutrients required by plants in relatively large quantities to support metabolism, structural development, and processes such as DNA synthesis. While many fertilizers rely on carriers that may add "dead weight"—such as calcium in certain phosphate fertilizers—ammonium phosphate is highly efficient because both the ammonium ion ($N{H}_4^{+}$) and the phosphate ion ($P{O}_4^{3-}$) serve as direct sources of these vital nutrients. By using ammonia to neutralize phosphoric acid, manufacturers create a product where both constituents contribute to the fertility of the soil, rather than relying on inert filler materials.312