Can fertigation reduce nitrous oxide emissions from wheat and canola fields?

Chai, Leanne L.; Hernandez‐Ramirez, Guillermo; Dyck, Miles; Pauly, D.; Kryzanowski, L.; Middleton, A. B.; Powers, Leigh-Anne; Lohstraeter, Germar; Werk, Deb

doi:10.1016/j.scitotenv.2020.141014

Cited by 25 publications

(52 citation statements)

References 40 publications

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“…The fact that N 2 O EF area and plant N use were positively associated (Supplemental Figure S4) indicates that the high N availability in these soils served in a dual capacity as a substrate for detrimental N 2 O production and for beneficial crop N usage as recently found by Chai et al. (2020) in fertigated croplands. Our findings also indicate that the outcome of crop NRE at time of harvest could be indicated by the earlier mid‐season NDVI (Figure 2).…”

Section: Discussionsupporting

confidence: 62%

“…Conversely, Chai et al. (2020) reported a lower N 2 O EF of 0.23% for annual crop species in Southern Alberta, showcasing the variability of EF across regions. Moreover, a future Tier 3 EF approach may provide an even higher certainty and comprehensibility.…”

Section: Discussionmentioning

confidence: 95%

“…Nitrogen fertilization at seeding or, even better, in‐crop N fertilization can decrease the N substrate availability for N 2 O production, diminishing denitrification during the ES (Chai et al., 2020; Hernandez‐Ramirez et al., 2009; Tenuta et al., 2016). In temperate continental regions the risk of N 2 O emissions as a function of N fertilizer timing could be hypothetically ranked as: in‐crop < seeding < late fall < early fall.…”

Section: Discussionmentioning

confidence: 99%

“…Emitted N 2 O acts as a potent greenhouse gas (Myhre et al., 2013) and a precursor of stratospheric ozone depletion (Ravishankara, Daniel, & Portmann, 2009). Management practices that mitigate soil N 2 O production can have the co‐benefit of enhancing N use efficiency (NUE) in cropping systems (Chai et al., 2020; Van Groenigen, Velthof, Oenema, van Groenigen, & Kessel, 2010). In fact, improving NUE in crops can aid in moderating the global biogeochemical cycling of reactive N and in addressing climate change.…”

Section: Introductionmentioning

confidence: 99%

“…Increased availability of N in soils can prompt N 2 O production (Grant, Lin, & Hernandez‐Ramirez, 2020; Lin et al., 2017). Nevertheless, crop uptake can beneficially compete for this available N (Chai et al., 2020; Van Groenigen et al., 2010). Crop N uptake and potential productivity can be probed during the growing season by conducting measurements of normalized difference vegetation index (NDVI) over crop canopies (Guenette & Hernandez‐Ramirez, 2018; Holzapfel et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

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Nitrous oxide emissions and nitrogen use efficiency in wheat: Nitrogen fertilization timing and formulation, soil nitrogen, and weather effects

Thilakarathna

Hernandez‐Ramirez

Puurveen

et al. 2020

Soil Science Soc of Amer J

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Improving N fertilization in croplands could minimize soil emissions of nitrous oxide (N2O) and mitigate climate change. This study investigated the effects of spring vs. fall N applications of conventional vs. enhanced‐efficiency N fertilizers (EENFs) on N2O emissions and N use efficiency in spring wheat (Triticum aestivum L.) over 2.5 yr in Alberta, Canada. Fertilizers were anhydrous ammonia and urea and the EENF formulations included urease and nitrification inhibitors and a polymer coating. We measured a fertilizer N2O emission factor of 0.31 ± 0.04%. Irrespective of N fertilizer and timing options peak N2O emissions were evident following soil thawing and major rainfalls. Because most of the annual N2O emissions were associated with soil thawing, spring‐applied N emitted half the N2O of the fall‐applied N during the second study year (P < .001). Conversely, the opposite was observed for the first study year when overall N2O emissions were 36% larger for spring‐ than fall‐applied N (P = .031) as major rainfalls occurred shortly after the spring N fertilization. Nevertheless, within this first study year, EENFs significantly reduced N2O emissions (by 26% on average; P = .019), with a tendency for 11% higher grain yield across springtime EENFs than for conventional fertilizers. Concomitantly, spring‐applied N doubled the fertilizer N recovery efficiency in the same year (P = .023). The soil at the study site inherently had high N availability (NH4 and NO3) and this probably moderated the beneficial effects of EENFs on N2O emissions and grain yields. Results suggest that spring EENFs can mitigate the risk for N2O emissions while sustaining high yields even under scenarios with high availability of native soil N.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrous oxide emissions and nitrogen use efficiency in wheat: Nitrogen fertilization timing and formulation, soil nitrogen, and weather effects

Thilakarathna

Hernandez‐Ramirez

Puurveen

et al. 2020

Soil Science Soc of Amer J

Self Cite

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Nitrous oxide emissions and productivity of irrigated potato: Effects of nitrogen fertilization options

et al. 2022

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Improved N management is needed in intensive agriculture to mitigate nitrous oxide (N2O) emissions while sustaining high yields. We assessed the effectiveness of polymer‐coated urea (PCU); nitrification inhibitor 2,4‐dimethylpyrazol succinic acid (DMPSA), a biostimulant; and their combinations with granular urea and ammonium sulfate nitrate (ASN) fertilizers to reduce N2O emissions and to improve potato (Solanum tuberosum L.) productivity under irrigation. Sites were located in Lethbridge and Brooks, Alberta, Canada over two growing seasons. Tuber yield, grade, specific gravity, and N uptake were quantified. We used the chamber method to measure N2O fluxes from potato hills and furrows. The N2O emissions from furrow positions were at least two‐fold greater than those from hills at the Lethbridge site. Peak N2O emissions and increased N concentrations in potato petiole and soils occurred shortly after fertilizer applications. The overall average emission factor (EF) of N2O was 0.056% kg N2O–N kg−1 N fertilizer (accounting for emissions from unfertilized controls). Urea alone commonly exhibited the highest N2O fluxes. Admixing DMPSA with either urea or ASN lowered N2O emissions in only certain cases. For instance, in one growing season at the Brooks site, adding DMPSA to urea reduced the N2O emissions by 57%. Likewise, in one of the four site‐years in the study, 36% higher potato marketable yields were obtained when applying either ASN treated with DMPSA or PCU compared with the unfertilized controls (45 vs. 33 Mg ha−1). Results showed that under specific conditions, N application strategies using DMPSA admixed with either urea or ASN can maintain high potato yields while reducing N2O emissions relative to soils receiving these fertilizers without this additive.

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How does management legacy, nitrogen addition, and nitrification inhibition affect soil organic matter priming and nitrous oxide production?

Thilakarathna

Hernandez‐Ramirez

2020

J of Env Quality

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Long‐term management of croplands influences the fluxes and sources of nitrous oxide (N2O). We examined this premise in a greenhouse study by using soils collected from a 38‐yr‐old field experiment. The sampled treatments were continuous barley (Hordeum vulgare L.; CB), continuous fescue (Festuca rubra L., F. arundinacea Schreb; CF), and two phases of an 8‐yr rotation: faba bean (Vicia faba L.; FB) and alfalfa (Medicago sativa L.)–bromegrass (Bromus inermis Leyss) hay. Barley was grown as a test crop in the greenhouse in each soil. The ranking of N2O emissions was hay > FB > CB > CF (P < .001). We quantified the 15N‐site preference to assess the N2O‐producing processes. Denitrification was the predominant source, contributing 77.4% of the N2O production. We also evaluated nitrogen (N) additions: urea alone or urea with a nitrification inhibitor (nitrapyrin or DMPSA). Compared with urea alone, nitrapyrin and DMPSA reduced N2O emissions by 16 and 25%, respectively. We used urea labeled with 15N to trace N to N2O emissions, aboveground plant N uptake, and N retention by soils. Total 15N‐recovery (N2O + plant + soil) was highest under FB (86%) and lowest under CB (29%). We further separated the N2O derived from urea versus N2O from soil organic matter (SOM). The inhibitor DMPSA reduced the N2O derived specifically from added urea‐N by more than half (P < .001). With the addition of urea, N2O production from mineralization of SOM‐N accelerated over the control (without urea), termed the priming effect. This priming of SOM‐N contributed with 13% of the total N2O production when averaged across the four management legacies. The CB soil had the highest proportion of priming‐derived N2O (24%). Management legacies clearly differed in soil carbon and N, which governed N2O production from denitrification and SOM priming.

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Can fertigation reduce nitrous oxide emissions from wheat and canola fields?

Cited by 25 publications

References 40 publications

Nitrous oxide emissions and nitrogen use efficiency in wheat: Nitrogen fertilization timing and formulation, soil nitrogen, and weather effects

Nitrous oxide emissions and nitrogen use efficiency in wheat: Nitrogen fertilization timing and formulation, soil nitrogen, and weather effects

Nitrous oxide emissions and productivity of irrigated potato: Effects of nitrogen fertilization options

How does management legacy, nitrogen addition, and nitrification inhibition affect soil organic matter priming and nitrous oxide production?

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