Alkyl sulfonyl sulfonamides

A compound of the formula ##STR160## wherein R.sub.1 is S(O).sub.n R.sub.3 ;

• R.sub.2 is H, F, Cl, Br, CH.sub.3, OCH.sub.3, CF.sub.3 or NO.sub.2 ;
• R.sub.3 is C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.4 alkenyl or cyclopropylmethyl;
• n is 0, 1 or 2
• X is CH.sub.3, C.sub.2 H.sub.5, CH.sub.3 O, C.sub.2 H.sub.5 O, or CH.sub.2 OCH.sub.3 ;
• Y is NH.sub.2, NHCH.sub.3 or N(CH.sub.3).sub.2 ;
• and
• Z is N;
• and their agriculturally suitable salts;
• provided that when R.sub.3 is C.sub.1 -C.sub.3 alkyl and Y is NH.sub.2 or NHCH.sub.3, then X is other than Cl, CH.sub.2 CH.sub.3 or CH.sub.2 OCH.sub.3.