Substituted 4-benzoylpyrazole of the formula I where: Q is a pyrazole of the formula II X1 is a straight-chain or branched C1-C6-alkylene, a C2-C6-alkenylene or a C2-C6-alkynylene chain which is interrupted by a hetero atom selected from the group consisting of: oxygen and sulfur, Het is a three- to six-membered partially or fully saturated heterocyclic group or a three- to six-membered heteroaromatic group having up to three hetero atoms selected from the following three groups: nitrogen, oxygen in combination with at least one nitrogen or sulfur in combination with at least one nitrogen; and agriculturally useful salts thereof, processes and intermediates for preparing compounds of the formula I, compositions comprising them and the use of the compounds of the formula I and of compositions comprising them for controlling harmful plants are described.