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Title: Tillage and N-source influence soil-emitted nitrous oxide in the Alberta Parkland region

Abstract

Zero tillage systems are receiving attention as possible strategies for sequestering atmospheric carbon. This benefit may be offset by increased N2O emissions, which have been reported for soils under zero tillage (ZT) compared to those under more intensive tillage (IT). Comparisons of N2O emissions from the two systems have been restricted to the growing season, but substantial losses of N2O have been reported during spring thaw events in many regions. Inorganic and organic additions of nitrogen and fallowing have also been shown to increase levels of soil-emitted N2O. The objectives for this study were: (i) to confirm that losses of N2O are higher under ZT than under IT in Alberta Parkland agroecosystems; (ii) to compare the relative influence of urea fertilizer (56 or 100 kg N h--1), field pea residue (dry matter at 5 Mg h--1), sheep manure (dry matter at 40 Mg h--1) additions, and fallow on total N2O losses; and (iii) to investigate possible interactions between fertility and tillage treatments. Gas samples were collected using vented soil covers at three sites near Edmonton, Alberta during 1993, 1994, and 1995. Gas samples were analyzed using a gas chromatograph equipped with a 63Ni electron capture detector. Estimated annual N2O lossmore » ranged from 0.1 to 4.0 kg N ha-1. Emissions during summer were slightly higher, similar, or lower on ZT compared to those under IT, but were consistently lower on ZT plots during spring thaw. Combined estimates (spring plus summer) of N2O loss under ZT were equal to or lower than those under IT. Highest overall losses were observed on fallow plots, followed by fertilizer, pea residue, and then either manure or control plots. We conclude that ZT management systems have potential for reducing agricultural greenhouse gas emissions in the Alberta Parkland region.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15016926
Report Number(s):
PNNL-SA-42228
Journal ID: ISSN 0008-4271; CJSSAR; KP1202020; TRN: US200516%%1198
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Canadian Journal of Soil Science
Additional Journal Information:
Journal Volume: 79; Journal Issue: 1; Journal ID: ISSN 0008-4271
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; CARBON; ELECTRON CAPTURE; FERTILITY; FERTILIZERS; GREENHOUSE GASES; MANAGEMENT; MANURES; NITROGEN; NITROUS OXIDE; PEAS; RESIDUES; SHEEP; SOILS; UREA; Nitrous oxide, thawing soil, tillage, nitrogen fertilizer, manure, fallow

Citation Formats

Lemke, R L, Izaurralde, R Cesar C, Nyborg, M, and Solberg, E D. Tillage and N-source influence soil-emitted nitrous oxide in the Alberta Parkland region. United States: N. p., 1999. Web. doi:10.4141/S98-013.
Lemke, R L, Izaurralde, R Cesar C, Nyborg, M, & Solberg, E D. Tillage and N-source influence soil-emitted nitrous oxide in the Alberta Parkland region. United States. https://doi.org/10.4141/S98-013
Lemke, R L, Izaurralde, R Cesar C, Nyborg, M, and Solberg, E D. 1999. "Tillage and N-source influence soil-emitted nitrous oxide in the Alberta Parkland region". United States. https://doi.org/10.4141/S98-013.
@article{osti_15016926,
title = {Tillage and N-source influence soil-emitted nitrous oxide in the Alberta Parkland region},
author = {Lemke, R L and Izaurralde, R Cesar C and Nyborg, M and Solberg, E D},
abstractNote = {Zero tillage systems are receiving attention as possible strategies for sequestering atmospheric carbon. This benefit may be offset by increased N2O emissions, which have been reported for soils under zero tillage (ZT) compared to those under more intensive tillage (IT). Comparisons of N2O emissions from the two systems have been restricted to the growing season, but substantial losses of N2O have been reported during spring thaw events in many regions. Inorganic and organic additions of nitrogen and fallowing have also been shown to increase levels of soil-emitted N2O. The objectives for this study were: (i) to confirm that losses of N2O are higher under ZT than under IT in Alberta Parkland agroecosystems; (ii) to compare the relative influence of urea fertilizer (56 or 100 kg N h--1), field pea residue (dry matter at 5 Mg h--1), sheep manure (dry matter at 40 Mg h--1) additions, and fallow on total N2O losses; and (iii) to investigate possible interactions between fertility and tillage treatments. Gas samples were collected using vented soil covers at three sites near Edmonton, Alberta during 1993, 1994, and 1995. Gas samples were analyzed using a gas chromatograph equipped with a 63Ni electron capture detector. Estimated annual N2O loss ranged from 0.1 to 4.0 kg N ha-1. Emissions during summer were slightly higher, similar, or lower on ZT compared to those under IT, but were consistently lower on ZT plots during spring thaw. Combined estimates (spring plus summer) of N2O loss under ZT were equal to or lower than those under IT. Highest overall losses were observed on fallow plots, followed by fertilizer, pea residue, and then either manure or control plots. We conclude that ZT management systems have potential for reducing agricultural greenhouse gas emissions in the Alberta Parkland region.},
doi = {10.4141/S98-013},
url = {https://www.osti.gov/biblio/15016926}, journal = {Canadian Journal of Soil Science},
issn = {0008-4271},
number = 1,
volume = 79,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1999},
month = {Fri Jan 01 00:00:00 EST 1999}
}