Assessing the efficiency of dimethylpyrazole-based nitrification inhibitors under elevated CO2 conditions

Nitrification inhibitors (NIs) are useful tools to reduce nitrogen (N) losses derived from fertilization in agriculture. However, it remains unclear whether a future climate scenario with elevated CO2 could affect NIs efficiency. Thus, the objective of this work was study increase atmospheric concentration would efficiency two dimethylpyrazole-based NIs: 3,4-dimethylpyrazol phosphate (DMPP) and succinic acid (DMPSA) plant-soil microcosm. To do so, Hordeum vulgare var. Henley plants were grown soil fertilized ammonium sulphate (AS) or without under controlled environmental conditions at ambient (aCO2) (eCO2; 700 ppm). In soil, mineral N2O emission evolution monitored together nitrifying denitrifying population that quantified by qPCR. plant, biomass, total amino content isotopic discrimination N C measured. Both showed greater maintain NH4+ eCO2 compared aCO2, as consequence 80% reduction AOB abundance eCO2. Indeed, both able lessen 53% emissions aCO2. Regarding DMPP DMPSA negatively affected plant biomass aCO2 but effect restored due better tolerance associated an content. Overall, highly efficient eCO2, reducing keeping stable for longer while maintaining production.