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Gaseous Nitrogen Losses from Soils Under Zero‐Till as Compared with Conventional‐Till Management Systems
Open accessAbstract
The gaseous losses of N from conventional‐till (CT) and zero‐till (ZT) crop fields were 3 to 7 and 12 to 16 kg N ha−1 y−1, respectively. In contrast, losses from CT and ZT fallow were severalfold higher, namely, 12 to 14 and 34 kg N ha−1, respectively. The more dense surface soil and consistently higher moisture content (lower air‐filled porosity) were identified as major factors affecting increased denitrification under ZT. The potential denitrification rates were markedly higher under ZT, and the population of denitrifiers was up to six times higher than in CT soil samples. The contribution of lower soil horizons towards gaseous N losses was found to be low on both CT and ZT fields, and this finding was confirmed from a survey carried out on three other widely differing soils. Volumetric soil moisture and air temperature were the only two of several factors that accounted for a significant portion of the variations in gaseous N fluxes under field conditions. The average mole fraction of N 2 O ranged from almost 100% to as low as 28% of the total gaseous products and showed a negative relationship with soil moisture.
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“Reduced tillage may, however, increase N 2 O emissions due to decreased soil aeration and higher soil moisture contents (Aulakh et al., 1984;Linn & Doran, 1984;Smith & Conen, 2004;Rochette, 2008).”
From Land‐use change to bioenergy production in Europe: implications for the greenhouse gas balance and soil carbon (2012) · cites this paper as Aulakh et al., 1984
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“The topic has been explored by many authors, for instance Aulakh et al. (1984) and Six et al. (2004) Reductions in nitrous oxide emissions might be brought about by two mechanisms a) Avoiding soil compaction and waterlogging, particularly in the zone where high concentrations of nitrate fertilizer…”
Metadata
- Authors
- Aulakh, M. S., Rennie, D. A., & Paul, E. A.
- Affiliations
- University of Saskatchewan (CA)
- Venue
- Journal of Environmental Quality
- Publisher
- Wiley
- Published
- 1984-01
- Volume
- 13
- Issue
- 1
- Pages
- 130-136
- ISSN
- 0047-2425 (ISSN-L)
- 1537-2537
- OpenAlex
- W1983639362
- Cited by
- 164
- References
- 0
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 2 · 2019: 3 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 1 · 2014: 7 · 2013: 3 · 2012: 6
- FWCI
- 6.91
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Journal of Environmental Quality (publishedVersion)
- Digital Collections of Colorado (Colorado State University) (submittedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Management and Crop Yield
- Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
- Keywords
- nitrogen loss, no-tillage, conventional tillage, denitrification, nitrous oxide, soil moisture, air-filled porosity, soil compaction, denitrifying bacteria, fallow, soil management systems
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