FIELD: agriculture. SUBSTANCE: described are 3-halogen-3-hetarylcarboxylic acid derivatives of formula I: 
wherein R is -C(O)R1 wherein R1 is C1-C4 alkoxy group or -OR9 wherein R9 is hydrogen or alkali metal cation; R2 and R3 is C1-C4 alkoxy group; X is CR13 wherein R13 is hydrogen; R4 is fine-or six-membered heteroaromatic ring containing one or two nitrogen atoms and/or one sulfur atom or one oxygen atom which contains one or several residues from among C1-C4-alkyl, or phenyl; R5 is hydrogen or C1-C4-alkyl; Y is sulfur or oxygen; Z is halogen, and herbicidal agent based thereon. Said compounds have herbicidal activity. EFFECT: improved properties of the title compounds. 5 cl, 5 ex, 9 tbl
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