A herbicidal mixture comprising a) a herbicidally active amount of a 3-heterocyclyl-substituted benzoyl derivative of the formula I  in which the variables have the following meanings: R1,R2 are hydrogen, halogen, C1-C6-alkyl, C1-C6-alkylthio, C1-C6-alkylsulfinyl, C1-C6-alkylsulfonyl, C1-C6-haloalkyl, C1-C6-alkoxy, C1-C6-haloalkoxy; R3 is hydrogen, halogen, C1-C6-alkyl; X is a heterocycle from amongst the group consisting of isoxazolyl, 4,5-dihydroisoxazolyl and thiazolyl, it being possible for the heterocycle to be optionally monosubstituted or polysubstituted by halogen, C1-C6-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, C1-C4-haloalkoxy, C1-C4-alkylthio; R5 is hydrogen or C1-C6-alkyl, R6 is C1-C6-alkyl, or their environmentally compatible salts; b) a nitrogenous fertilizer in a synergistically effective amount and c) an adjuvant in a synergistically effective amount.