3,4-Dimethylpyrazole phosphate(DMPP), CAS No: 202846-98-6

A new nitrification inhibitor the use on and in solid and liquid fertilizers and slurries

3,4-Dimethylpyrazole phosphate (DMPP) is a new nitrification inhibitor with highly favourable properties. It has been shown to have several distinct advantages compared to the currently used nitrification inhibitors. Application rates of 0.5–1.5 kg/ha are sufficient to achieve optimal nitrification inhibition. DMPP can significantly reduce NO3 – leaching, without being liable to leaching itself. DMPP may reduce N2O emission, 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-application rounds, and obtaining higher crop yields with current fertilizer-N rates. It reduces activity of ammonia oxidizers without adverse effects on non-target soil microorganisms and functions.

Advantages:

1)       A sandy loam soil was exposed to DMPP at normal and ten-fold higher dose, the efficiency of DMPP seems better in the sandy loam soil than in the clay loam soil and lasts longer.

2)       Non-target soil functions and total microbial biomass were unaffected by DMPP.

3)       Minor trends in phospholipid fatty acid composition were not significant.

4)       The inhibition of potential ammonia oxidation was independent of DMPP dose.

DMPP reduced cell-specific nitrification rates, but probally not populations.