Provided herein are synergistic herbicidal compositions containing (a) a compound of formula (I): or an agriculturally acceptable salt or ester thereof and (b) a protoporphyrinogen oxidase inhibitor, e.g., acifluorfen, azafeniden, bifenox, carfentrazone-ethyl-ethyl, flumioxazin, ipfencarbazone, oxadiargyl, oxadiazon, oxyfluorfen, pentoxazone, pyraclonil, pyraflufen-ethyl and saflufenacil, or a salt or ester thereof. The compositions and methods provided herein provide control of undesirable vegetation, e.g., in direct-seeded, water-seeded and transplanted rice, cereals, wheat, barley, oats, rye, sorghum, corn or maize, sugarcane, sunflower, oilseed rape, canola, sugar beet, soybean, cotton, pineapple, pastures, grasslands, rangelands, fallowland, turf, tree and vine orchards, aquatics, plantation crops, vegetables, industrial vegetation management (IVM) and rights-of-way (ROW).本發明係提供協同性除草組成物，其包含(a)式(I)化合物：或其農業上可接受之鹽類或酯類，以及(b)原紫質原(protoporphyrinogen)氧化酶抑制劑，例如，亞喜芬(acifluorfen)、草芬定(azafeniden)、必芬諾(bifenox)、乙基克繁草(carfentrazone-ethyl-ethyl)、丙炔氟草胺(flumioxazin)、艾分卡巴腙(ipfencarbazone)、丙炔噁草酮(oxadiargyl)、樂滅草(oxadiazon)、復祿芬(oxyfluorfen)、環戊噁草酮(pentoxazone)、雙唑草腈(pyraclonil)、乙基派芬草(pyraflufen-ethyl)與殺芬草(saflufenacil)，或其鹽類或酯類。本發明組成物與方法提供了，例如，直播、湛水直播與插秧稻米、穀類、小麥、大麥、燕麥、黑麥、高粱、玉蜀黍或玉米、甘蔗、向日葵、芸苔、油菜、甜菜、大豆、棉花、鳳梨、牧草、草地、牧場、休耕地、草皮、樹與藤園、水生植物、種植作物、蔬菜、工業植被管理(IVM)與路權用地(ROW)，之不良植被之控制。
