The present invention relates to the use of piperazine compounds of the formula I or of the agriculturally useful salts of piperazine compounds of the formula I as herbicides, where in formula I the variables are as defined in the claims and the description. Moreover, the invention relates to compositions comprising, in addition to auxiliaries customary for formulating crop protection agents, piperazine compounds of the formula I or agriculturally useful salts of I, and to a process for preparing these compositions. Furthermore, the invention relates to certain piperazine compounds of the formula I, a process for preparing piperazine compounds of the formula I and a method for controlling unwanted vegetation which comprises treating plants, their seeds and/or their habitat with at least one piperazine compound of the formula I.本發明係有關一種以式I之哌化合物或式I哌化合物之農業上適用之鹽作為除草劑之用途,其中式I之代號如請求項及本說明書中之定義。此外,本發明係有關一種組合物,其中除了調配作物保護劑常用之輔助物質外,尚包含式I哌化合物或I之農業上適用之鹽,並有關製備此等組合物之方法。此外,本發明係有關某些式I哌化合物,製備式I哌化合物之方法及控制不要之植物生長之方法,其包括以至少一種式I哌化合物處理植物、其種子與/或其棲息地。
