Effect of calcareous and siliceous amendments on<scp>N<sub>2</sub>O</scp>emissions of a grassland soil

Vekic, Teodora Todorcic; Nadeem, Shahid; Molstad, Lars; Martinsen, Vegard; Hiis, Elisabeth Gautefall; Bakken, Lars; Rütting, Tobias; Klemedtsson, Leif; Dörsch, Peter

doi:10.1111/sum.12913

Soil Use and Management

2023

DOI: 10.1111/sum.12913

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Effect of calcareous and siliceous amendments onN₂Oemissions of a grassland soil

Teodora Todorcic Vekic,

Shahid Nadeem,

Lars Molstad

et al.

Abstract: Liming of acidic agricultural soils has been proposed as a strategy to mitigate nitrous oxide (N 2 O) emissions, as increased soil pH reduces the N 2 O/N 2 product ratio of denitrification. The capacity of different calcareous (calcite and dolomite) and siliceous minerals to increase soil pH and reduce N 2 O emissions was

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2024

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Cited by 3 publications

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Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Pfülb,

Elsgaard,

Dörsch

et al. 2024

Biol Fertil Soils

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Since it is known that nitrous oxide (N2O) production and consumption pathways are affected by soil pH, optimising the pH of agricultural soils can be an important approach to reduce N2O emissions. Because liming effects on N2O reduction had not been studied under ambient atmosphere and typical bulk density of arable soils, we conducted mesoscale incubation experiments with soils from two liming trials to investigate the impact of long-term pH management and fresh liming on N transformations and N2O production. Soils differed in texture and covered a range of pH levels (3.8–6.7), consisting of non-limed controls, long-term field-limed calcite and dolomite treatments, and freshly limed soils. Both soils were amended with 15N-labelled potassium nitrate (KNO3) and incubated with and without incorporated maize litter. Packed soil mesocosms were cycled through four phases of alternating temperatures and soil moistures for at least 40 days. Emissions of N2O and dinitrogen (N2) as well as the product ratio of denitrification N2O/(N2O + N2), referred to as N2Oi were measured with the 15N gas flux method in N2-reduced atmosphere. Emissions of N2O increased in response to typical denitrifying conditions (high moisture and presence of litter). Increased temperature and soil moisture stimulated microbial activity and triggered denitrification as judged from 15NO3− pool derived N2O + N2 emissions. Fresh liming increased denitrification in the sandy soil up to 3-fold but reduced denitrification in the loamy soil by 80%. N2Oi decreased throughout the incubation in response to fresh liming from 0.5–0.8 to 0.3–0.4, while field-limed soils had smaller N2Oi (0.1–0.3) than unlimed controls (0.9) irrespective of incubation conditions. Our study shows that the denitrification response (i.e., N2O + N2 production) to liming is soil dependent, whereas liming effects on N2Oi are consistent for both long- and short-term pH management. This extends previous results from anoxic slurry incubation studies by showing that soil pH management by liming has a good mitigation potential for agricultural N2O emissions from denitrification under wet conditions outside of cropping season.

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Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Pfülb,

Elsgaard,

Dörsch

et al. 2024

Biol Fertil Soils

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Increased global warming potential during freeze-thaw cycle is primarily due to the contribution of N2O rather than CO2

Zhao,

Liu,

Wang

et al. 2024

Science of The Total Environment

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Greenhouse gas emissions from sandy soils amended with lime and gypsum under different initial soil pH and nitrogen sources

Ribeiro,

Hamta,

Mühling

2024

Soil Use and Management

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Lime (CaCO3) application has led to an inconsistent mitigation of greenhouse gas emissions (GHGs) from agricultural soils. In addition, only a few studies have investigated the impact of gypsum (CaSO4) on the release of GHGs. Therefore, here we investigated the impact of initial soil pH and nitrogen sources on CaSO4 and CaCO3 effectiveness in reducing the production of GHGs. We hypothesized that (i) liming presents the highest effectiveness in reducing GHGs when performed in acidic soil and under NO3−‐N fertilizer application, and (ii) application of CaSO4 is not effective in reducing GHG irrespective of the initial soil pH or nitrogen (N) source. Firstly, an incubation experiment was carried out to evaluate the effect of initial soil pH using acidic soil and neutral soil amended with CaSO4 and CaCO3. Subsequently, a second incubation experiment was conducted to investigate the effect of N source by applying calcium nitrate and urea in an acidic soil amended with CaSO4, CaCO3 and CaSO4 + CaCO3. The measured variables were soil , daily and cumulative emissions of N2O‐N, CO2‐C and CH4‐C, as well as NH4+‐N and NO3−‐N concentrations. CaCO3 did not affect N2O‐N emission under neutral soil pH, and NO3−‐N fertilizer application. However, CaCO3 increased N2O‐N release under acidic soil (+96%), and urea fertilizer application (+97%). Furthermore, CaCO3 and CaSO4 reduced CO2‐C emission from the neutral pH soil by 31%, and CaSO4 decreased the mean cumulative N2O‐N release from the soil fertilized with urea‐N by 43%. In conclusion, this study did not confirm liming as an alternative to reduce N2O‐N release under different initial soil pH and N sources. Furthermore, our results indicated that CaSO4 may decrease GHG emissions. Finally, these results suggest caution for considering liming as a strategy to mitigate N2O‐N emission from agriculture.

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Effect of calcareous and siliceous amendments onN₂Oemissions of a grassland soil

Cited by 3 publications

References 61 publications

Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Increased global warming potential during freeze-thaw cycle is primarily due to the contribution of N2O rather than CO2

Greenhouse gas emissions from sandy soils amended with lime and gypsum under different initial soil pH and nitrogen sources

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Effect of calcareous and siliceous amendments onN2Oemissions of a grassland soil

Cited by 3 publications

References 61 publications

Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Impact of liming and maize residues on N2O and N2 fluxes in agricultural soils: an incubation study

Increased global warming potential during freeze-thaw cycle is primarily due to the contribution of N2O rather than CO2

Greenhouse gas emissions from sandy soils amended with lime and gypsum under different initial soil pH and nitrogen sources

Contact Info

Product

Resources

About

Effect of calcareous and siliceous amendments onN₂Oemissions of a grassland soil