A HERBICIDAL COMPOSITION INCLUDING RIMSULFURON WITH ANTI HYDROLYSIS AGENT WHEREIN THE ANTI HYDROLYSIS AGENT IS 2 ISOXAZOLINE 3 CARBOXYLIC ACID DERIVATIVES HAVING FORMULA (I) IN WHICH R IS PHENYL WHICH IS UNSUBSTITUTED OR SUBSTITUTED R IS (C C) ALKYL (C C) CYCLOALKYL OR PHENYL EACH OF THE 3 LAST MENTIONED RADICALS IS UNSUBSTITUTED OR SUBSTITUTED R IS HYDROGEN OR A HYDROCARBON RADICAL HAVING 1 TO 18 C ATOMS WHICH IS UNSUBSTITUTED OR SUBSTITUTED. A METHOD FOR CONTROLLING WEEDS INCLUDING APPLYING TO A PLANT PLANT PART OR LOCUS THEREOF AN EFFECTIVE AMOUNT OF THE HERBICIDAL COMPOSITION. A METHOD FOR IMPARTING HYDROLYSIS RESISTANCE TO A HERBICIDAL COMPOSITION CONTAINING RIMSULFURON BY ADDING TO THE COMPOSITION AN EFFECTIVE AMOUNT OF THE COMPOUND OF FORMULA (I).