Mixture for the treatment of urea-containing fertilizers

A mixture for the treatment of urea-containing fertilizers, comprising

• a) at least one (thio)phosphoric acid triamide of the general formula (I) and/or (thio)phosphoric acid diamide of the general formula (II)
• R1R2N—P(X)(NH2)2 (I)
• R1O—P(X)(NH2)2 (II)
• with the following definitions:
• X is oxygen or sulfur,
• R1 and R2 independently of one another are hydrogen, in each case substituted or unsubstituted 2-nitrophenyl, C1-10 alkyl, C3-10 cycloalkyl, 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 moiety, which optionally may also contain one or two further heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur, as component A,
• b) at least one compound containing an amino group or a substituted amino group, as component B, having a boiling point of more than 100° C., wherein component (B) is at least one selected from the group consisting of methyldiethanolamine, tetrahydroxypropylethylenediamine, trimethylaminoethylethanolamine, N,N,N′,N′-tetramethyl-1,6-hexanediamine, N,N′,N″-tris(dimethylaminopropyl)hexahydrotriazine, 2,2′-dimorpholinyldiethyl ether and mixtures thereof.