Abstract: Specific substituted 2,4-dioxodiazolidines and 2,4-dioxothiadiazolidines falling within the general formula ##STR1## in which R is lower alkyl; X is H, halo, lower alkyl, trifluoromethyl, or lower alkoxy, including multiple substituents; Y is H, halo, lower alkyl, trifluoromethyl, lower alkoxy, or phenoxy, including multiple substituents; and Z is C or S; are useful as herbicidal agents.

Abstract: 2-(Disubstituted amino)acetamides of the formula ##STR1## wherein R is alkyl or phenyl; R.sup.1 is selected from the group consisting of amino, alkyl, allyl, substituted carbonyl wherein said substituent is haloalkyl, alkoxycarbonyl, alkylthio, carboxy, alkoxy, alkyl, vinyl, haloanilino, phenylthio, alkylamino, benzylamino, alkoxycarbonylalkyl or substituted carbamyl wherein the substituent is alkyl halocarbanilide; alkylthio thiocarbonyl; or mono-haloanilino carbonylmethylene, alkoxy carbonylmethylene, or carboxymethylene; R.sup.2 is hydrogen, alkyl or phenyl; X is halo or haloalkyl; and n is an integer selected from 1-3, inclusive; the compounds are useful as herbicidal agents.