Diammonium phosphate (DAP) is the world's most popular phosphorus fertilizer. Due to its high nutrient content and excellent physical properties, it is a popular choice for farming and other applications.

Diammonium phosphate (DAP), a water-soluble salt of ammonium phosphate, is produced by the reaction of ammonia with phosphoric acid. The substance is widely used as a fertilizer when applied to plant food. It is also used as a fire retardant, a yeast nutrient in wine making and in brewing mead.