An composition comprising: a mixture comprising at least one (thio)phosphoric acid triamide according to the general formula R 1 R 2 N-P (NH 2) 2, wherein X is oxygen or sulfur; R 1 is a C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, or dialkylaminocarbonyl group; R 2 is H, or R 1 and R 2 together with the nitrogen atom linking them define a 5- or 6-membered saturated or unsaturated heterocyclic radical, which optionally comprises 1 or 2 further heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, and at least one amine selected from the group consisting of a polymeric polyamine, and an amine containing not more than one amino group and at least three alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 21, wherein at least one of the groups R 21 is different to the other groups R 21, and an amine containing not more than one amino group and at least two alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 22, wherein at least one of the groups R 22 bears the alkoxy or hydroxy substituent at a secondary or tertiary carbon atom and wherein at least one of the groups R 22 is different to the other group(s) R 22, and an amine containing at least one saturated or unsaturated C 8 to C 40 alkyl group R 23, and a saturated or unsaturated heterocyclic amine which contains at least one oxygen atom as ring atom and which does not contain a further alkoxy group. a mixture comprising at least one (thio)phosphoric acid triamide according to the general formula R 1 R 2 N-P (NH 2) 2, wherein X is oxygen or sulfur; R 1 is a C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, or dialkylaminocarbonyl group; R 2 is H, or R 1 and R 2 together with the nitrogen atom linking them define a 5- or 6-membered saturated or unsaturated heterocyclic radical, which optionally comprises 1 or 2 further heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, and X is oxygen or sulfur; R 1 is a C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, or dialkylaminocarbonyl group; R 2 is H, or R 1 and R 2 together with the nitrogen atom linking them define a 5- or 6-membered saturated or unsaturated heterocyclic radical, which optionally comprises 1 or 2 further heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, at least one amine selected from the group consisting of a polymeric polyamine, and an amine containing not more than one amino group and at least three alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 21, wherein at least one of the groups R 21 is different to the other groups R 21, and an amine containing not more than one amino group and at least two alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 22, wherein at least one of the groups R 22 bears the alkoxy or hydroxy substituent at a secondary or tertiary carbon atom and wherein at least one of the groups R 22 is different to the other group(s) R 22, and an amine containing at least one saturated or unsaturated C 8 to C 40 alkyl group R 23, and a saturated or unsaturated heterocyclic amine which contains at least one oxygen atom as ring atom and which does not contain a further alkoxy group. a polymeric polyamine, and an amine containing not more than one amino group and at least three alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 21, wherein at least one of the groups R 21 is different to the other groups R 21, and an amine containing not more than one amino group and at least two alkoxy- or hydroxy-substituted C 2 to C 12 alkyl groups R 22, wherein at least one of the groups R 22 bears the alkoxy or hydroxy substituent at a secondary or tertiary carbon atom and wherein at least one of the groups R 22 is different to the other group(s) R 22, and an amine containing at least one saturated or unsaturated C 8 to C 40 alkyl group R 23, and a saturated or unsaturated heterocyclic amine which contains at least one oxygen atom as ring atom and which does not contain a further alkoxy group.