The present invention relates to an herbicidal composition including a pyridine sulfonylurea compound represented by Formula 1 below as an active ingredient, the pyridine sulfonylurea compound being an isomer mixture including an erythro form and a threo form, the isomer mixture including 92 % by weight or more of the erythro form:wherein n represents an integer of 1 to 3, R is a hydrogen atom or a C1 to C4 alkyl group, R’ is a hydrogen atom, a C1 to C4 alkyl group, a C1 to C3 haloalkyl group, a halogen group, or a C1 to C2 alkoxy group, and X and Y are each independently a C1 to C2 alkyl group, a C1 to C2 alkoxy group, a C1 to C2 haloalkoxy group, or a halogen group.本發明係關於除草組成物，其包括作為活性成分的下式1所示之吡啶磺醯脲化合物，該吡啶磺醯脲化合物是包括赤型(erythro)與蘇型的異構物混合物，該異構物混合物包括92重量%或更多之赤型：其中n代表1至3的整數，R是氫原子或C1至C4烷基，R'是氫原子、C1至C4烷基、C1至C3鹵烷基、鹵素基、或C1至C2烷氧基，及X與Y各獨立地是C1至C2烷基、C1至C2烷氧基、C1至C2鹵烷氧基、或鹵素基。
