Gross Ammonification and Nitrification Rates in Soil Amended with Natural and NH4-Enriched Chabazite Zeolite and Nitrification Inhibitor DMPP

Using zeolite-rich tuffs for improving soil properties and crop N-use efficiency is becoming popular. However, the mechanistic understanding of their influence on N-processes still poor. This paper aims to shed new light how natural NH4+-enriched chabazite zeolites alter short-term N-ammonification nitrification rates with without use inhibitor (DMPP). We employed 15N pool dilution technique determine gross ammonification in a silty-clay amended two typologies chabazite-rich tuff: (1) at state (2) enriched NH4+-N from an animal slurry. Archaeal bacterial amoA, nirS nosZ genes, N2O-N CO2-C emissions were also evaluated. The results showed modest effects only nitrate production rates, which was slightly delayed compared unamended soil. On other hand, addition stimulated production, emissions, but reduced NO3−-N abundance nirS-nosZ genes. DMPP reducing dependent N not affected by tested. outcomes this study indicated good compatibility both zeolite DMPP. In particular, application recommended mitigate losses.