Pyridazinone herbicidal compounds

A compound of Formula (I):

• or an agronomically acceptable salt thereof,
• wherein:—
• X1 is N or CR4;
• R1 is selected from the group consisting of C1-C4alkyl, C1-C2alkoxy-C1-C2 alkyl, C2-C4alkenyl, C1-C4haloalkyl, C2-C4haloalkenyl, C2-C4alkynyl and C2-C4haloalkynyl;
• R2 is selected from the group consisting of hydrogen, halogen, cyano, C1-C6alkyl, C1-C6haloalkyl, C1-C6haloalkoxy, C1-C3haloalkoxy-C1-C3alkyl-, C1-C6alkoxy, C1-C3alkoxy-C1-C3alkyl, C1-C3alkoxy-C1-C3alkoxy-C1-C3alkyl-, C3-C6cycloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C1-C6hydroxyalkyl-, C1-C6alkylcarbonyl-, —S(O)pC1-C6alkyl, amino, C1-C6alkylamino, C1-C6dialkylamino, —C(C1-C3alkyl)=N—O—C1-C3alkyl and C2-C6 haloalkynyl;
• R3 is independently selected from the group consisting of hydrogen, halogen, nitro, cyano, amino, C1-C6alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C1-C6alkoxy, C1-C6alkoxycarbonyl and —S(O)pC1-C6 alkyl;
• R4 and R5 are independently selected from the group consisting of hydrogen, hydroxyl, halogen, nitro, cyano, amino, C1-C6alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C1-C6alkoxy, C1-C6alkoxycarbonyl and —S(O)pC1-C6 alkyl;
• G is hydrogen or —C(O)—R6;
• R6 is selected from the group consisting of C1-C6alkyl, C1-C6alkenyl, C1-C6alkynyl, C1-C6alkyl-S—, C1-C6alkoxy, —NR7R8 and phenyl optionally substituted by one or more R9;
• R7 and R8 are independently selected from the group consisting of C1-C6 alkyl, C1-C6 alkoxy-;
• wherein R7 and R8 can together form a morpholinyl ring;
• R9 is selected from the group consisting of halogen, cyano, nitro, C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy and C1-C3haloalkoxy;
• n=0, 1, 2, 3 or 4;
• and
• p=0, 1 or 2.