The nitrification inhibitor DMPP (3,4-dimethylpyrazole phosphate) reduces N2 emissions from intensively managed pastures in subtropical Australia

Friedl, Johannes; Scheer, Clemens; Rowlings, David; Mumford, Majella; Grace, Peter R.

doi:10.1016/j.soilbio.2017.01.016

Cited by 65 publications

(48 citation statements)

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“…The main source of N 2 O in both soils was denitrification, accounting for more than 90% of N 2 O produced ( Fig. 2), which is in line with previous results from both field 11 and laboratory studies 10,12 . The ability of soils to act as an N 2 O sink, i.e.…”

Section: Discussionsupporting

confidence: 91%

“…The high microbial activity in the loam also infers a larger number of microsites with nitrifying activity compared to the sandy CL, suggesting the spatial separation of DMPP from nitrifiers may be responsible for the short-term inefficacy of DMPP to reduce autotrophic nitrification in the loam. This theory is further supported by a study where DMPP did not affect the initial pulse of N 2 O after fertilization and irrigation from the loam, but reduced denitrification losses after that initial period 11 . This shows a delayed effect of DMPP in this soil, demanding further research on how diffusion in the soil matrix, sorption and distribution affects DMPPs efficacy to reduce autotrophic nitrification.…”

Section: Discussionmentioning

confidence: 59%

“…www.nature.com/scientificreports www.nature.com/scientificreports/ Nitrification activity during pre-incubation increased NO 3 − levels in both soils. In the loam, NO 3 − levels were above those measured at the respective field site, which is also reflected in higher N 2 O d /(N 2 O d + N 2 ) ratios 11 . This phenomenon often occurs in incubation studies, where the absence of plant uptake, pre-incubation 33,34 , and the addition of glucose 26 increases NO 3 − levels in the soil.…”

Section: Discussionmentioning

confidence: 72%

“…These pulses are short-lived and can account for more than 90% of cumulative N 2 O emissions from agro-ecosystems 17 , defining the critical time-window which determines the efficacy of NIs to mitigate N 2 O emission. Building on extensive research at the field scale conducted across different agro-ecosystems 5,11,[18][19][20] , this study investigated the short-term effect of 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover and N 2 O and N 2 emissions from two contrasting agricultural soils in response to N-fertilization. We combined a 15 N tracing analysis with the direct quantification of N 2 and N 2 O emissions using the 15 N gas flux method, complemented with the quantification of the nosZ gene via quantitative polymerase chain reaction (qPCR) in a soil microcosm study to constrain factors determining the efficacy of the NI DMPP to mitigate N 2 O emissions from agricultural soils.…”

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confidence: 99%

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Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Friedl

Scheer

Rowlings

et al. 2020

Sci Rep

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Nitrification inhibitors (NIs) have been shown to reduce emissions of the greenhouse gas nitrous oxide (n 2 O) from agricultural soils. However, their N 2 O reduction efficacy varies widely across different agroecosystems, and underlying mechanisms remain poorly understood. To investigate effects of the NI 3,4-dimethylpyrazole-phosphate (DMPP) on N-turnover from a pasture and a horticultural soil, we combined the quantification of N 2 and N 2 O emissions with 15 N tracing analysis and the quantification of the N 2 O-reductase gene (nosZ) in a soil microcosm study. Nitrogen fertilization suppressed nosZ abundance in both soils, showing that high nitrate availability and the preferential reduction of nitrate over N 2 O is responsible for large pulses of N 2 O after the fertilization of agricultural soils. DMPP attenuated this effect only in the horticultural soil, reducing nitrification while increasing nosZ abundance. DMPP reduced N 2 O emissions from the horticultural soil by >50% but did not affect overall n 2 + N 2 O losses, demonstrating the shift in the N 2 o:n 2 ratio towards N 2 as a key mechanism of N 2 O mitigation by NIs. Under non-limiting NO 3 − availability, the efficacy of NIs to mitigate N 2 O emissions therefore depends on their ability to reduce the suppression of the N 2 O reductase by high NO 3 − concentrations in the soil, enabling complete denitrification to N 2 .Agricultural soils have become the main source of anthropogenic nitrous oxide (N 2 O), a powerful greenhouse gas and the single most important substance depleting stratospheric ozone 1 . Delaying the conversion of ammonium (NH 4 + ) to nitrate (NO 3 − ), nitrification inhibitors (NIs) have been suggested as a means to reduce N 2 O emissions from agricultural soils. NIs demonstrated their efficacy across different cropping soils 2 , but results vary widely, and in particular in pasture soils the use of NIs had no or little effect on N 2 O emissions 3-5 . Despite a growing body of research on NIs, mechanisms and factors determining their efficacy to reduce N 2 O emission remain poorly understood 6 . The challenges to understand these mechanisms derive from the fact that N 2 O is formed via several different pathways in the soil matrix 7 , tightly coupled to different processes of N supply and consumption 8 . Critically, N 2 O can be further reduced to N 2 via the microbial-mediated process of denitrification, and the sole quantification of N 2 O as affected by NIs provides therefore only a limited insight into mechanisms of N 2 O mitigation using NIs.Microbial metabolic pathways can contribute via a wealth of different processes to N 2 O production and consumption, i.e. the reduction to N 2 in soils. Apart from abiotic processes, N 2 O formation can be categorized into www.nature.com/scientificreports www.nature.com/scientificreports/ nitrification-mediated pathways, denitrification and biotic formation of hybrid N 2 O 9 . Denitrification is generally assumed to be the main process contributing to overall N 2 O production from agricultu...

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 72%

mentioning

confidence: 99%

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Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Friedl

Scheer

Rowlings

et al. 2020

Sci Rep

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“…Past studies across a range of land uses and N sources demonstrate the interactive effects of WFPS on D p /D o and associated N 2 O emissions: under inorganic-N fertilizer with WFPS above 65 to 80% rapid and nonlinear increases in N 2 O emissions occurred (McTaggart et al, 2002) which were attributed to denitrification-derived N 2 O production; Schaufler et al (2010) found that N 2 O emissions in grasslands (fertilized and unfertilized) peaked around a WFPS of 80% with the moisture optima soil type dependent (Schaufler et al, 2010): Petersen et al (2008) reported nonlinear variations in N 2 O fluxes in response to varying WFPS irrespective of the soil type under varying tillage treatments. An in situ study by Friedl et al (2017) examined the potential for nitrification inhibitors to reduce N 2 losses from intensively managed subtropical pastures, found that N 2 losses were triggered when D p /D o values indicated the development of anaerobic conditions ( < 0.02, Stepniewski, 1980). Owens et al (2017) examined N 2 O fluxes from ruminant urine-affected soil, with respect to WFPS and D p /D o , and reported that D p /D o explained the variability in N 2 O fluxes better than WFPS, 73 and 65% respectively, and that, consistent with earlier laboratory studies (Balaine et al, 2013;Balaine et al, 2016), N 2 O emissions become elevated as D p /D o declined toward a value of 0.006.…”

Section: N 2 O Emissionsmentioning

confidence: 99%

Soil‐Gas Diffusivity and Soil‐Moisture effects on N₂O Emissions from Intact Pasture Soils

Deepagoda

Jayarathne

Clough

et al. 2019

Soil Science Soc of Amer J

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Grazed pastures are recognized as a dominant source of nitrous oxide (N2O), a highly potent greenhouse gas. Studies have examined soil physical controls on N2O emissions, including soil moisture status. Limited attempts to link N2O emissions with soil‐diffusivity (Dp/Do), using repacked soil cores, have shown peak N2O emissions to align with a relatively narrow window of Dp/Do, despite a relatively wide range in water‐filled pore space (WFPS), across a range of soil bulk densities. Such detailed studies have not been performed with intact soil cores. We investigated the effects of soil‐water characteristic (SWC) and Dp/Do on N2O emissions from intact soil samples, retrieved at three depths (0–5, 5–10, 10–15 cm) from three perennial pasture sites that received a KNO3 solution (1800 mg, N mL−1). We observed distinct fingerprints of SWC and Dp/Do, which showed clear effects of soil structure on diffusion‐controlled gas emissions. Depth‐wise variation in soil moisture diminished as the soil was subjected to higher matric potential (> ∼ ‐100 kPa). Variation in Dp/Do, was more pronounced in the dry soil (> ∼ ‐1000 kPa), being largely constrained by soil moisture in wet soil (∼ ‐100 kPa) with little depth‐wise variation. Measured N2O fluxes peaked within narrow ranges of WFPS and Dp/Do, 0.90–0.95 and 0.005–0.01, respectively. The value of Dp/Do can be determined using parametric models and presents a pasture management (e.g., irrigation, soil physical disturbance such as pasture renovation and animal treading)) tool to minimize N2O emissions: soil Dp/Do should be maintained above a range of 0.005–0.01 to minimize N2O emissions. Core Ideas Peak N2O fluxes from intact soil cores occurred when diffusivity ranged from 0.005–0.01 This peak N2O flux diffusivity range was 0.005–0.01 regardless of soil or depth (0–15 cm) The diffusivity range for peak N2O flux equalled that observed in repacked soil cores Diffusivity values are readily determined and add to the suite of soil management tools

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Environmental and economic trade‐offs of using composted or stockpiled manure as partial substitute for synthetic fertilizer

et al. 2021

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Manure generated from livestock production could represent an important source of plant nutrients in substitution of synthetic fertilizer. To evaluate the sustainability of partially substituting synthetic fertilizer with soil organic amendments (OA) in horticulture, an economic and greenhouse gas (GHG) budget was developed. The boundary for analysis included manure processing (stockpiling versus composting), transport and spreading of manure and compost (feedlot and chicken) in intensively cultivated horticultural fields. The OA field application rates were calculated based on the nitrogen supplied by OA. The GHG budget based on directly measured emissions indicates that the application of composted manure, in combination with reduced fertilizer rate, was always superior to stockpiled manures. Compost treatments showed from 9 to 90% less GHG emissions than stockpiled manure treatments. However, higher costs associated with the purchase and transport of composted manure (3 times higher) generated a greater economic burden compared to stockpiled manure and synthetic fertilizer application. However, the plant nutrient replacement value of the OA was considered only for the first year of application and if long term nutrient release from OA is taken into account, additional savings are possible. As the income from soil carbon sequestration initiatives in response to OA application are unlikely to bridge this financial gap, particularly in the short-term, this study proposes that future policy should develop methodologies for avoided GHG emissions from OA application. The combined income from soil carbon sequestration and potentially avoided GHG initiatives could incentivize farmers to adopt OA as a substitute for synthetic fertilizers, thereby promoting more sustainable farming practices.

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The nitrification inhibitor DMPP (3,4-dimethylpyrazole phosphate) reduces N2 emissions from intensively managed pastures in subtropical Australia

Cited by 65 publications

References 68 publications

Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Soil‐Gas Diffusivity and Soil‐Moisture effects on N₂O Emissions from Intact Pasture Soils

Environmental and economic trade‐offs of using composted or stockpiled manure as partial substitute for synthetic fertilizer

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The nitrification inhibitor DMPP (3,4-dimethylpyrazole phosphate) reduces N2 emissions from intensively managed pastures in subtropical Australia

Cited by 65 publications

References 68 publications

Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Effect of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on N-turnover, the N2O reductase-gene nosZ and N2O:N2 partitioning from agricultural soils

Soil‐Gas Diffusivity and Soil‐Moisture effects on N2O Emissions from Intact Pasture Soils

Environmental and economic trade‐offs of using composted or stockpiled manure as partial substitute for synthetic fertilizer

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Soil‐Gas Diffusivity and Soil‐Moisture effects on N₂O Emissions from Intact Pasture Soils