Mixture for treating fertilisers containing urea

A mixture for the treatment of urea-containing fertilizers, comprising component A and component B, wherein component A comprises:

• a) at least one (thio)phosphoric triamide of the general formula (I) and/or (thio)phosphoric diamide of the general formula (II)
• R1R2N—P(X)(NH2)2 (I)
• R1O—P(X)NH2)2 (II)
• wherein
• X is oxygen or sulfur, and
• R1 and R2 independently of one another are hydrogen, in each case substituted or unsubstituted 2-nitrophenyl, C1-10 alkyl, C3-10cycloalkyl, C3-10 heterocycloalkyl, C6-10 aryl, C6-10 heteroaryl or diaminocarbonyl, it also being possible for R1 and R2, together with the nitrogen atom joining them, to form a 5- or 6-membered saturated or unsaturated heterocyclic radical, which optionally may also contain one or two further heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur,
• and component B comprises:
• b) 2-(N-3,4-dimethylpyrazole)succinic acid, or a salt thereof,
• where component A and component B are in a weight ratio in a range from 1:1 to 1:6.