3,4-Dimethylpyrazole phosphate (DMPP) - a new nitrification inhibitor for agriculture and horticulture - An introduction

3,4-Dimethylpyrazole phosphate (DMPP) is a new nitrification inhibitor with highly favourable properties. It has undergone thorough toxicology and eco toxicology tests and application-technology experiments, and has been shown to have several distinct advantages compared to the currently used nitrifi cation inhibitors. Application rates of 0.5-1.5 kg ha(-1) are sufficient to achieve optimal nitrification inhibition. DMPP can significantly reduce NO 3- leaching, without being liable to leaching itself. DMPP may reduce N2O e mission, apparently without a negative effect on CH4 oxidation of the soil. The use of DMPP-containing fertilizers can improve yield. This offers the possibility of saving mineral fertilizer N, reducing the number of N-applic ation rounds, and obtaining higher crop yields with current fertilizer-N ra tes.