2-(Phosphonooxy)benzoic acid is primarily used in the field of agriculture as a plant growth regulator. It helps in enhancing the growth and development of plants by improving nutrient uptake and increasing resistance to environmental stress. Additionally, it is utilized in the synthesis of certain pharmaceuticals, where it acts as an intermediate in the production of drugs that target specific biochemical pathways. In industrial applications, it serves as a chelating agent, aiding in the stabilization of metal ions in various chemical processes. Its properties also make it useful in water treatment, where it helps in controlling scale formation and corrosion.