Herbicidal composition

A herbicidal composition comprising a pyridazinone compound represented by the formula (I):

• wherein R1 represents a C1-6 alkyl group or a (C1-6 alkyloxy) C1-6 alkyl group,
• R2 represents a hydrogen atom or a C1-6 alkyl group,
• G represents a hydrogen atom or any one of the groups represented by the following formulas:
• wherein L represents an oxygen atom or a sulfur atom,
• R3 represents a C1-6 alkyl group, a C3-8 cycloalkyl group, a C2-6 alkenyl group, a C2-6 alkynyl group, a C6-10 aryl group, a (C6-10 aryl) C1-6 alkyl group, a C1-6 alkyloxy group, a C2-6 cycloalkyloxy group, a C2-6 alkenyloxy group, a C2-6 alkynyloxy group, a C6-10 aryloxy group, a (C6-10 aryl) C1-6 alkyloxy group, an amino group, a C1-6 alkylamino group, a C2-6 alkenylamino group, a C6-10 arylamino group, a di (C1-6 alkyl)amino group, a di (C2-6 alkenyl)amino group, a (C1-6 alkyl) (C6-10 aryl)amino group or a 3 to 8-membered nitrogen-containing heterocyclic group,
• R4 represents a C1-6 alkyl group, a C6-10 aryl group, a C1-6 alkylamino group or a di(C1-6 alkyl)amino group, and
• R5 and R6 are the same or different and each represents a C1-6 alkyl group, a C3-8 cycloalkyl group, a C2-6 alkenyl group, a C6-10 aryl group, a C1-6 alkyloxy group, a C3-8 cycloalkyloxy group, a C6-10 aryloxy group, a (C6-10 aryl) C1-6 alkyloxy group, a C1-6 alkylthio group, a C1-6 alkylamino group or a di (C1-6 alkyl)amino group,
• provided that any group represented by R3, R4, R5 and R6 may be substituted with at least one halogen atom, and the C3-8 cycloalkyl group, the C6-10 aryl group, the aryl moiety of the (C6-10 aryl)C1-6 alkyl group, the C3-8 cycloalkyloxy group,
• the C6-10 aryloxy group, the aryl moiety of the (C6-10 aryl)C1-6 alkyloxy group, the aryl moiety of the C6-10 arylamino group, the aryl moiety of the (C1-6 alkyl) (C6-10 aryl)amino group and the 3- to 8-membered nitrogen-containing heterocyclic group may be substituted with at least one C1-6 alkyl group,
• Z1 represents a C1-6 alkyl group;
• Z2 represents a C1-6 alkyl group,
• n represents 0, 1, 2, 3 or 4, and when n represents an integer of two or more, each Z2 may be the same or different, provided that the total number of carbon atoms in the groups represented by Z1 and n×Z2 is two or more;
• flumioxazin;
• and one herbicide selected from the following group A.
• Group A:
• chlorimuron-ethyl,
• cloransulam-methyl, and
• glyphosate or an agriculturally acceptable salt thereof