Ammonium polyphosphate is widely used as a flame retardant in various materials, including plastics, textiles, and coatings. It works by promoting the formation of a protective char layer that insulates the material and prevents the spread of fire. In agriculture, it serves as a slow-release fertilizer, providing a sustained supply of phosphorus and nitrogen to plants, which enhances growth and improves crop yields. Additionally, it is utilized in intumescent fireproofing systems, where it expands when exposed to heat, creating a barrier that protects structural elements from fire damage. Its versatility and effectiveness make it a valuable component in both industrial and agricultural applications.