Herbicides

A process for combating the growth of unwanted plants, which comprises applying to the plants or the locus of the plants a herbicidally effective amount of a 6H-1,2,4,6-thiatriazine-1,1-dioxide of the formula ##STR46## where R.sup.1 and R.sup.2 independently of one another are a saturated or unsaturated straight-chain aliphatic radical of 1 to 10 carbon atoms, a cycloaliphatic radical of 3 to 7 carbon atoms, a branched saturated or unsaturated aliphatic radical of 3 to 10 carbon atoms, a halogen-, alkoxy- or alkylmercapto-substituted aliphatic radical of 2 to 10 carbon atoms or a cycloalkoxy-substituted aliphatic radical of 4 to 10 carbon atoms,

• R.sup.1 may also be unsubstituted or halogen-, or lower alkyl- or lower alkoxy-substituted phenyl, unsubstituted or halogen-substituted benzyl or tetrahydrofurylmethyl,
• R.sup.2 may also be a halogen-, alkoxy-, dialkylketone- or alkylmercapto-substituted unsaturated aliphatic radical or a dialkylketone-substituted aliphatic radical of 3 to 10 carbon atoms, lower alkoxy-carbo-lower alkoxy, lower alkylmercapto-carbo-lower alkoxy, lower alkoxy-carbo-lower alkylmercapto, lower alkylmercapto-carbo-lower alkylmercapto, aryl which is unsubstituted or substituted by halogen, lower alkyl, halo-lower alkyl, lower alkoxy, halo-lower alkoxy, lower alkylmercapto halo-lower alkylmercapto, lower alkylsulfinyl, halo-lower alkylsulfinyl, lower alkylsulfonyl, halo-lower alkylsulfonyl, nitro, cyano, azido, carboxyl, SCN, ##STR47##
• or by lower alkoxy-carbo-lower alkoxy, lower alkylmercapto-carbo-lower alkoxy, lower alkoxy-carbo-lower alkylmercapto or lower alkylmercapto-carbo-lower alkylmercapto;
• or R.sup.2 may also denote benzyl which is unsubstituted or substituted by halogen, lower alkyl, halo-lower alkyl, lower alkoxy, halo-lower alkoxy or halo-lower alkylmercapto,
• R.sup.3 is hydrogen, a straight-chain aliphatic radical of 1 to 10 carbon atoms, a cycloaliphatic radical of 3 to 7 carbon atoms, a branched aliphatic radical of 3 to 10 carbon atoms or halogen- or alkoxy-substituted alkyl of 2 to 10 carbon atoms,
• R.sup.4 and R.sup.5 are lower alkyl and R.sup.5 may also be hydrogen,
• X and Y are oxygen, sulfur, sulfinyl or sulfonyl and
• X.sup.1 is oxygen or sulfur.