Abstract: Herbicidial substituted phenyl tetrazolinones in which there is a substituted sulfonylamino group at the 5-position of the phenyl ring; intermediates and processes for producing them, including intermediates which are 2,4-dihalo-5-alkylsulfonylaminophenyl isothiocyanates; and compositions containing herbicides and methods for their use.

Abstract: Compounds of the formula ##STR1## in which Y is hydrogen, lower alkyl, or an alkali metal or alkaline earth metal, and Z is selected from hydrogen, a hydrogen halide complex or a tri(lower)alkylmethoxycarbonyl group, their use as herbicides and herbicidal compositions thereof are disclosed.

Abstract: Pyridinylurea compounds of the formula ##STR1## and acid addition salts thereof; wherein R is cyclo alkyl, alkenyl, or an alkyl group optionally substituted with halogen, hydroxy, cycloalkyl, alkoxy, dialkylamino or phenyl; R.sup.1 is hydrogen or alkyl; R and R.sup.1 together with the nitrogen atom of the NRR.sup.1 group optionally define a heterocycle containing 4 to 6 ring carbon atoms; X is hydrogen, halogen, haloalkyl, alkoxy, alkylthio or alkylsulfonyl; Y is hydrogen, halogen, haloalkyl, alkoxy, alkylthio or alkylsulfonyl; and wherein the NHCONRR.sup.1 group is bonded to the pyridinyl ring in the 3- or 4-position; provided that at least one of X and Y is other than hydrogen and when both R and R.sup.1 are alkyl, R is 1,1-dimethylethyl or cyclopentyl and R.sup.1 is methyl. The compounds are useful in agriculture as plant growth regulators.