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Ferretti, G; Galamini, G; Deltedesco, E; Gorfer, M; Fritz, J; Faccini, B; Mentler, A; Zechmeister-Boltenstern, S; Coltorti, M; Keiblinger, KM.
(2021): Gross Ammonification and Nitrification Rates in Soil Amended with Natural and NH4-Enriched Chabazite Zeolite and Nitrification Inhibitor DMPP
APPL SCI-BASEL. 2021; 11(6), 2605 FullText FullText_BOKU

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

Find related publications in this database (Keywords)
sustainable agriculture
soil amendment
N cycle
gross N transformation rates
N-15 pool dilution
nitrate production
enriched zeolite
microbial biomass
N processes

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