This regulation establishes three tolerances for the combined residues of the herbicide safener isoxadifen-ethyl in or on rice, grain; rice, straw; and rice, hulls. Bayer CropScience (formerly Aventis CropScience) requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA).