FIELD: chemistry.
SUBSTANCE: invention relates to a pyridazinone derivative of formula (I) 
in which radicals and symbols are defined in the claim. This compound has excellent effect in weed control and is suitable as an active ingredient of herbicides.
EFFECT: invention also relates to a herbicide, a weed control method and intermediate compounds for producing compounds of formula (I).
13 cl, 5 tbl, 25 ex
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