Nitric oxide and nitrous oxide emissions from cattle-slurry and mineral fertiliser treated with nitrification inhibitor to an agricultural soil: A laboratory approach

Abstract

The application of organic and mineral fertilisers to soil can result in increased gaseous emissions to the atmosphere such as nitric oxide (NO) and nitrous oxide (N 2 O) gases. The aim of this study was to evaluate under laboratory conditions the effects on mineral N dynamics and NO and N 2 O emissions of application to soil of cattle slurry derived liquid fraction (LF) obtained by screw press and mineral fertiliser (MF), both treated with or without the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP). An aerobic laboratory incubation was performed over 93 days with a Dystric Cambisol amended with mechanically separated LF or mineral fertiliser ammonium sulphate only or combined with DMPP. Two additional treatments were included: soil only and soil amended with DMPP. Nitrogen immobilisation was the dominant process with MF amendment, whereas N mineralisation has been observed with LF. The application of LF reduced significantly NO emissions by 80% relative to mineral but no differences were observed with N 2 O emissions. The addition of DMPP to MF induced a decrease of 18 and 29% in NO and N 2 O emissions whereas DMPP combined with LF reduced (numerically but not statistically) these emissions in 20 and 10%, respectively. Results obtained in our study suggest that N (NO + N 2 O) losses can be mitigated by adding DMPP to mineral fertilisers or replacing mineral fertiliser by LF.Additional key words: carbon dioxide; DMPP; N emissions; N mineralisation; solid-liquid separation.

The effect of nitrification inhibitor on N2O, NO and N2 emissions under different soil moisture levels in a permanent grassland soil

“…Most studies investigating the use of NIs did not consider the mitigation effect on NO emissions, which can be significant after fertilization (Pereira et al, 2015). Several recent studies reported a wide range of NO mitigation effects ranging from 35 to 80% when the NI was applied with mineral fertilizer N or slurry (Akiyama et al, 2010;Pereira et al, 2015Pereira et al, , 2010.…”

“…Most studies investigating the use of NIs did not consider the mitigation effect on NO emissions, which can be significant after fertilization (Pereira et al, 2015). Several recent studies reported a wide range of NO mitigation effects ranging from 35 to 80% when the NI was applied with mineral fertilizer N or slurry (Akiyama et al, 2010;Pereira et al, 2015Pereira et al, , 2010. In our study, application of the NI significantly reduced NO emissions at all three soil moisture conditions, which is likely due to the inhibition effect of NI on nitrification process, indicating that the overlooked mitigation effect of NI on NO emissions should be taken into account when evaluating NI's mitigation effect on GHG emissions.…”

The Effect of Soil Type on Gaseous Emissions from Flooded Rice Fields in Portugal

“…After each incubation period, three soil cores were randomly removed from the incubator and were divided into two depths (0-75, 75-150 mm), to be immediately analyzed for mineral N. Ammonium and NO 3 − were extracted with 2 M KCl (1:5 w/v) and filtrate (Whatman 42) was analyzed for NH 4 + and NO 3 − concentrations by automated segmented flow s p e c t r o p h o t o m e t r y ( S a n P l u s , S k a l a r , B r e d a , The Netherlands). Net mineralizable-N was determined according to Carranca et al (2009) and Pereira et al (2015).…”