Diammonium phosphate (DAP), with the chemical formula (NH4)2HPO4, is a chemical compound composed of diammonium ions (NH4+) and hydrogen phosphate ions (HPO4^2-). It is a white crystalline salt that is highly soluble in water. DAP is a widely used fertilizer due to its high phosphorus content, an essential nutrient for plant growth.

Some key properties and uses of diammonium phosphate include:

1. Fertilizer: DAP is a popular nitrogen-phosphorus fertilizer used in agriculture to provide both nitrogen and phosphorus nutrients to plants. The high phosphorus content makes it particularly suitable for promoting root development, flowering, and fruiting.
2. Fire Retardant: DAP is used as a fire retardant in certain applications, such as in the treatment of fabrics and wood products to reduce their flammability.
3. Food Additive: In the food industry, diammonium phosphate is used as a leavening agent in baking powders to help baked goods rise during baking.
4. Industrial Applications: DAP is used in various industrial processes, such as in the production of certain chemicals and in water treatment.

DAP is considered safe for its intended uses when handled properly. However, it should be used in accordance with the manufacturer’s instructions, and unnecessary exposure should be avoided.

As a fertilizer, diammonium phosphate is a valuable agricultural product that helps increase crop yields and improve plant health. Its use in fire retardants and as a food additive highlights its versatility in different industries.