DAP, or DiAmmonium Phosphate, is a fertilizer that contains both nitrogen and phosphorus in a 2:5 ratio. It is a white, crystalline powder that is water-soluble and easy to handle. DAP is used to improve the growth and yield of a wide variety of crops, including corn, soybeans, rice, and wheat. It helps to provide essential nutrients to plants, particularly phosphorus, which is needed for healthy root development and strong stems. In addition, DAP can help to improve soil fertility and maintain soil pH levels.