USE OF DIMETHYLPYRAZOLE PHOSPHATE IN CAN TYPE FERTILIZERS

The present invention therefore relates to use of dimethylpyrazole phosphate (DMPP) as a nitrification inhibitor in a solid fertilizer composition A comprising (a) 60 to 97% by weight, preferably 65 to 96% by weight, especially 66 to 95% by weight, based on the total weight of the fertilizer composition A in anhydrous form, of ammonium nitrate as component (a); and (b) 3 to 40% by weight, preferably 4 to 35% by weight, especially 5 to 34% by weight, based on the total weight of the fertilizer composition A in anhydrous form, of a component (b) containing at least one of the following compounds: (b.1) magnesium carbonate, (b.2) calcium sulfate, (b.3) calcium magnesium carbonate, (b.4) and magnesium oxide, or a mixture of calcium carbonate with at least one of magnesium carbonate, calcium sulfate, calcium magnesium carbonate and magnesium oxide, where the total amount of calcium carbonate, magnesium carbonate, calcium sulfate, calcium magnesium carbonate and magnesium oxide is at least 90% by weight, in particular at least 95% by weight, based on the total weight of the component (b); wherein the total theoretical amount of magnesium carbonate and calcium sulfate provided by the components contained in the component (b) is at least 3% by weight, preferably at least 4% by weight, especially at least 5% by weight, based on the total weight of the fertilizer composition A in anhydrous form, e. g. from 3 to 40% by weight, preferably from 4 to 35% by weight and especially from 5 to 34% by weight, based on the total weight of the fertilizer composition A in anhydrous form. The present invention also relates to a fertilizer composition comprising DMPP and the solid fertilizer composition A, and to a process for producing a fertilizer composition comprising the incorporation of DMPP into the fertilizer composition A. La présente invention concerne par conséquent l'utilisation de diméthylpyrazole phosphate (DMPP) en tant qu'inhibiteur de nitrification dans une composition d'engrais solide A comprenant (a) de 60 à 97 % en poids, de préférence de 65 à 96 % en poids, en particulier de 66 à 95 % en poids, sur la base du poids total de la composition d'engrais A sous forme anhydre, de nitrate d'ammonium en tant que composant (a) ; et (b) de 3 à 40 % en poids, de préférence de 4 à 35 % en poids, en particulier de 5 à 34 % en poids, par rapport au poids total de la composition d'engrais A sous forme anhydre, d'un composant (b) contenant au moins l'un des composés suivants :