Document Detail

Climate, duration, and N placement determine N2 O emissions in reduced tillage systems: a meta-analysis.
MedLine Citation:
PMID:  23504719     Owner:  NLM     Status:  In-Data-Review    
No-tillage and reduced tillage (NT/RT) management practices are being promoted in agroecosystems to reduce erosion, sequester additional soil C and reduce production costs. The impact of NT/RT on N2 O emissions, however, has been variable with both increases and decreases in emissions reported. Herein, we quantitatively synthesize studies on the short- and long-term impact of NT/RT on N2 O emissions in humid and dry climatic zones with emissions expressed on both an area- and crop yield-scaled basis. A meta-analysis was conducted on 239 direct comparisons between conventional tillage (CT) and NT/RT. In contrast to earlier studies, averaged across all comparisons, NT/RT did not alter N2 O emissions compared with CT. However, NT/RT significantly reduced N2 O emissions in experiments >10 years, especially in dry climates. No significant correlation was found between soil texture and the effect of NT/RT on N2 O emissions. When fertilizer-N was placed at ≥5 cm depth, NT/RT significantly reduced area-scaled N2 O emissions, in particular under humid climatic conditions. Compared to CT under dry climatic conditions, yield-scaled N2 O increased significantly (57%) when NT/RT was implemented <10 years, but decreased significantly (27%) after ≥10 years of NT/RT. There was a significant decrease in yield-scaled N2 O emissions in humid climates when fertilizer-N was placed at ≥5 cm depth. Therefore, in humid climates, deep placement of fertilizer-N is recommended when implementing NT/RT. In addition, NT/RT practices need to be sustained for a prolonged time, particularly in dry climates, to become an effective mitigation strategy for reducing N2 O emissions.
Chris van Kessel; Rodney Venterea; Johan Six; Maria Arlene Adviento-Borbe; Bruce Linquist; Kees Jan van Groenigen
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Publication Detail:
Type:  Journal Article     Date:  2012-08-03
Journal Detail:
Title:  Global change biology     Volume:  19     ISSN:  1354-1013     ISO Abbreviation:  Glob Chang Biol     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-03-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9888746     Medline TA:  Glob Chang Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  33-44     Citation Subset:  IM    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
Department of Plant Sciences, University of California, Davis, CA, 95616, USA.
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