Sulfonylureas of the general formula I ##STR1## where R.sup.1 is a methyl or ethyl group;R.sup.2 is C.sub.1 -C.sub.3 -alkoxycarbonyl, a C.sub.1 -C.sub.2 -alkyl group which carries 1 to 5 fluorine atoms, methylsulfonyl, dimethylaminosulfonyl, thiomethyl, methylsulfinyl, methylsulfonyloxy, trifluoromethoxy, difluoromethoxy, difluorochloromethoxy, difluorochloromethyl or nitro;R.sup.3 is hydrogen, methyl, methoxy, ethoxy, fluorine, chlorine or thiomethyl;W is hydrogen or chlorine andZ is CH or Nand their agriculturally utilizable salts are described.