Pyridazine derivatives, process for their preparation, compositions containing them and methods of regulating the growth of plants, increasing the yield of soya bean plants and sterilizing the male anthers of plants, including small grain cereal plants, using them as well as a method of producing F1 hybrid seed.

摘要

Compounds of general formula <CHEM> in which Ar represents an optionally substituted phenyl group; Y represents a hydrogen or halogen atom or an alkyl group; Z represents an alkyl group; and R represents an hydrogen atom, one equivalent of a cation, or an alkyl group; have useful plant growth regulating properties.