PROBLEM TO BE SOLVED: To provide a liquid herbicidal composition that controls any targeted principal weed among weeds belonging to the genus Gramineae and broadleaf weeds immediately effectively and accurately over a long period of time, has a light environmental load, is inexpensive, and can be sprayed without troubles, and to provide a herbicidal method.SOLUTION: The liquid herbicidal composition includes as effective ingredients sodium hydrogen carbonate and/or potassium hydrogen carbonate and/or an acetic acid salt and/or a citric acid salt, and some other herbicide, particularly a plant essential oil. The herbicidal method includes using the herbicidal composition.COPYRIGHT: (C)2010,JPO&INPIT【課題】標的の禾本科雑草、広葉雑草のいずれの重要雑草をも即効的でしかも的確にかつ長期にわたり防除でき、環境負荷の小さくかつ安価で手間無く散布できる液体状除草剤組成物及び除草方法を提供する。【解決手段】炭酸水素ナトリウム及び/または炭酸水素カリウム及び/または酢酸塩及び/またはクエン酸塩と他の除草剤、特に植物精油を有効成分として含有することを特徴とする液体状除草剤組成物、及びその除草剤組成物を使用する除草方法。【選択図】なし