Amine salts of phenyl-4-hydroxypyridazines and the preparation and herbicidal compositions thereof

An amine salt of a 3-phenyl-6-halo-4-hydroxy-pyridazine of the formula ##STR8## wherein X is selected from the group consisting of chlorine and bromine, R.sub.1 is selected from the group consisting of alkyl containing up to 14 carbon atoms, alkenyl containing up to 6 carbon atoms, cycloalkyl containing 5 to 7 carbon atoms, and alkyl contaning up to 14 carbon atoms which is monosubstituted by hydroxy, alkoxy containing up to 10 carbon atoms, cyano, amino, lower monoalkylamino or lower dialkylamino, and

• R.sub.2 and R.sub.3 are each selected from the group consisting of hydrogen and the groups defined above with respect to R.sub.1,
• or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form heterocyclic selected from the group consisting of pyrrolidino pyrrolidino monosubstituted by lower alkyl, pyrrolidino disubstituted by lower alkyl, piperidino, piperidino monosubstituted by lower alkyl and piperidino disubstituted by lower alkyl.