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  3,4-Dimethylpyrazole Phosphate advert image shown if present

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A nitrification inhibitor, with the active phase typically being from 4 to 10 weeks, depending upon soil temperature, soil relative humidity and soil pH. It aims to reduce nitrous oxide (N2O) emissions/losses due to denitrification, and nitrate (NO3-) leaching, especially in higher rainfall areas, although its effectiveness can be variable due to the many potential contributory and interacting factors. It is usually just referred to by its acronym of DMPP. (Further reading: Hao-ruo LI, Xiao-tong SONG, Lars R. BAKKEN, Xiao-tang JU, ‘Reduction of N2O emissions by DMPP depends on the interactions of nitrogen sources (digestate vs. urea) with soil properties’, Journal of Integrative Agriculture, Volume 22, Issue 1, 2023, Pages 251-264, https://doi.org/10.1016/j.jia.2022.08.009)