Denitrification losses from an intensively managed sub-tropical pasture – Impact of soil moisture on the partitioning of N 2 and N 2 O emissions

Friedl, Johannes; Scheer, Clemens; Rowlings, David; McIntosh, H.; Strazzabosco, Alice; Warner, D.; Grace, Peter R.

doi:10.1016/j.soilbio.2015.09.016

Cited by 79 publications

(30 citation statements)

References 63 publications

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“…The generation of nitrogen gas (N 2 ) is of agronomic interest in terms of nutrient management since such gaseous losses may imply a significant loss of N from the soil-plant system (Cameron et al, 2013;Friedl et al, 2016). However, from an environmental stance, N 2 is innocuous and, thus, the preferred type of gaseous N loss from soil .…”

Section: Introductionmentioning

confidence: 99%

Potential short-term losses of N2O and N2 from high concentrations of biogas digestate in arable soils

Fiedler

Augustin

Wrage‐Mönnig

et al. 2017

SOIL

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Abstract. Biogas digestate (BD) is increasingly used as organic fertilizer, but has a high potential for NH 3 losses. Its proposed injection into soils as a countermeasure has been suggested to promote the generation of N 2 O, leading to a potential trade-off. Furthermore, the effect of high nutrient concentrations on N 2 losses as they may appear after injection of BD into soil has not yet been evaluated. Hence, we performed an incubation experiment with soil cores in a helium-oxygen atmosphere to examine the influence of soil substrate (loamy sand, clayey silt), water-filled pore space (WFPS; 35, 55, 75 %) and application rate (0, 17.6 and 35.2 mL BD per soil core, 250 cm 3 ) on the emission of N 2 O, N 2 and CO 2 after the usage of high loads of BD. To determine the potential capacity for gaseous losses, we applied anaerobic conditions by purging with helium for the last 24 h of incubation. Immediate N 2 O and N 2 emissions as well as the N 2 / (N 2 O+N 2 ) product ratio depended on soil type and increased with WFPS, indicating a crucial role of soil gas diffusivity for the formation and emission of nitrogenous gases in agricultural soils. However, emissions did not increase with the application rate of BD. This is probably due to an inhibitory effect of the high NH + 4 content of BD on nitrification. Our results suggest a larger potential for N 2 O formation immediately following BD injection in the fine-textured clayey silt compared to the coarse loamy sand. By contrast, the loamy sand showed a higher potential for N 2 production under anaerobic conditions. Our results suggest that short-term N losses of N 2 O and N 2 after injection may be higher than probable losses of NH 3 following surface application of BD.

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Section: Introductionmentioning

confidence: 99%

Potential short-term losses of N2O and N2 from high concentrations of biogas digestate in arable soils

Fiedler

Augustin

Wrage‐Mönnig

et al. 2017

SOIL

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“…To test the incubation setup, we used arable soil from a subtropical dairy pasture in Gympie, Australia . The general soil properties are given in Table .…”

Section: Methodsmentioning

confidence: 99%

An improved ¹⁵N tracer approach to study denitrification and nitrogen turnover in soil incubations

Scheer

Meier

Brüggemann

et al. 2016

Rapid Comm Mass Spectrometry

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The high and N2 O-dominated denitrification rates found in this study are pointing at both the high ecological and the agronomic importance of denitrification in subtropical pasture soils. The new system allows for a direct and highly sensitive detection of N2 and N2 O fluxes from soils and may help to significantly improve our mechanistic understanding of N cycling and denitrification in terrestrial agro-ecosystems. Copyright © 2016 John Wiley & Sons, Ltd.

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“…We hypothesised that any denitrification would be largely N 2 during this time and N 2 O emissions would be minimal (Ciarlo et al 2008). Recent work by Friedl et al (2016) found that the N 2 /(N 2 +N 2 O) ratio increased with increasing soil moisture (to 100% water filled pore space, WFPS) in sub-tropical pastures, and Harris et al (2013) hypothesised that this was the reason for low N 2 O emissions from cropping sites during periods when soil WFPS exceeded 90%.…”

Section: N 2 O Emissionsmentioning

confidence: 97%

Influence of enhanced efficiency fertilisation techniques on nitrous oxide emissions and productivity response from urea in a temperate Australian ryegrass pasture

Suter

Sultana

Davies³

et al. 2016

Soil Res.

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Abstract. The effect of a nitrification inhibitor on nitrous oxide (N 2 O) emissions across seasons, the effect of a urease inhibitor and a fine particle spray (both targeting ammonia (NH 3 ) loss) on N 2 O emissions, and the potential for productivity benefits and efficiencies by using these enhanced efficiency fertilisers (EEFs) were investigated in temperate pastures. The study compared three treatments over an eight month period (April to December 2010): (1) urea (U), (2) urea with a nitrification inhibitor (3,4-dimethylpyrazole phosphate) (DMPP), and (3) urea with a urease inhibitor (N-(n-butyl) thiophosphoric triamide (NBTPT)) (GU). In autumn, when NH 3 loss was predicted to be high, the effect of urea applied as a fine particle spray (containing urea, NBTPT and gibberellic acid (10 g ha -1 )) (FPA) on N 2 O emissions and productivity was determined.N 2 O emissions from urea applied to pastures were low, and were larger in spring than autumn due to soil moisture and temperature. DMPP was an effective tool for mitigating N 2 O emissions, decreasing fertiliser-induced N 2 O emissions relative to urea by 76% over eight months. However, the urease inhibitor (NBTPT) (GU) increased N 2 O emissions from urea by 153% over eight months. FPA had no impact on N 2 O, but was only examined during periods of low emission (autumn). No significant biomass productivity, agronomic efficiency benefits, or improvements in apparent fertiliser recovery were observed with the DMPP and GU treatments. A significant biomass productivity benefit was observed with the FPA treatment 55 days after fertiliser was applied, most likely because of the gibberellic acid. The outcomes highlight that although DMPP effectively decreased N 2 O emissions it had no impact on biomass productivity compared with urea. The use of the GU increased N 2 O emissions by preserving NH 3 in the soil. To avoid this a lower rate of N should be applied with the urease inhibitor.

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Denitrification losses from an intensively managed sub-tropical pasture – Impact of soil moisture on the partitioning of N 2 and N 2 O emissions

Cited by 79 publications

References 63 publications

Potential short-term losses of N<sub>2</sub>O and N<sub>2</sub> from high concentrations of biogas digestate in arable soils

Potential short-term losses of N<sub>2</sub>O and N<sub>2</sub> from high concentrations of biogas digestate in arable soils

An improved ¹⁵N tracer approach to study denitrification and nitrogen turnover in soil incubations

Influence of enhanced efficiency fertilisation techniques on nitrous oxide emissions and productivity response from urea in a temperate Australian ryegrass pasture

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Denitrification losses from an intensively managed sub-tropical pasture – Impact of soil moisture on the partitioning of N 2 and N 2 O emissions

Cited by 79 publications

References 63 publications

Potential short-term losses of N&lt;sub&gt;2&lt;/sub&gt;O and N&lt;sub&gt;2&lt;/sub&gt; from high concentrations of biogas digestate in arable soils

Potential short-term losses of N&lt;sub&gt;2&lt;/sub&gt;O and N&lt;sub&gt;2&lt;/sub&gt; from high concentrations of biogas digestate in arable soils

An improved 15N tracer approach to study denitrification and nitrogen turnover in soil incubations

Influence of enhanced efficiency fertilisation techniques on nitrous oxide emissions and productivity response from urea in a temperate Australian ryegrass pasture

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Potential short-term losses of N<sub>2</sub>O and N<sub>2</sub> from high concentrations of biogas digestate in arable soils

Potential short-term losses of N<sub>2</sub>O and N<sub>2</sub> from high concentrations of biogas digestate in arable soils

An improved ¹⁵N tracer approach to study denitrification and nitrogen turnover in soil incubations