This rule establishes tolerances for residues of the herbicide prosulfuron, 1-(4-methoxy-6-methyl-triazin-2-yl)-3-[2- (3,3,3- trifluoropropyl)-phenylsulfonyl]-urea in or on the raw agricultural commodities corn (forage, fodder, grain and fresh [including sweet kernels plus cobs with husks removed]), milk, and meat, fat and meat by-products, of cattle, goats, hogs, horses, and sheep. The regulation was requested by Ciba-Geigy Corporation and establishes the maximum permissible level for residues of the herbicide in or on corn.