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 and Z is CH or N and their agriculturally utilizable salts are described.

Sulfonylureas del ## generale del ## STR1 di formula I in cui R.sup.1 è un gruppo metilico o etilico; R.sup.2 è C.sub.1 - C.sub.3 - alkoxycarbonyl, un C.sub.1 - C.sub.2 - gruppo alchile che trasporta 1 - 5 atomi, methylsulfonyl, dimethylaminosulfonyl, thiomethyl, methylsulfinyl, methylsulfonyloxy, trifluoromethoxy, difluoromethoxy, difluorochloromethoxy, difluorochloromethyl o nitro del fluoro; R.sup.3 è idrogeno, metile, metossilico, ethoxy, fluoro, cloro o thiomethyl; Il W è idrogeno o il cloro e la Z è CH o la N ed i loro sali sul piano agricolo utilizzabili sono descritti.