Disclosed are compounds of Formula (1), including all stereoisomers, N-oxides, and salts thereof (Formula (1)) wherein K, Z, R2, R3 and m are as defined in the disclosure. Also disclosed are compositions containing the compounds, N-oxides and salts, processes for making such compounds, N-oxides, salts and compositions, and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound, N-oxide, salt or composition.