NDLI: Short-term effect of tillage intensity on N$_{2}$O and CO$

Content Provider	Springer Nature Link
Author	Boeckx, Pascal Van Nieuland, Katja Van Cleemput, Oswald
Copyright Year	2011
Abstract	The effect of tillage on the overall greenhouse gas balance of croplands is not clear. It has been suggested that ceasing tillage increases C sequestration, but has the risk of enhancing N$_{2}$O emission, which could switch the greenhouse gas balance from negative to positive. We studied the short-term effect of tillage intensity on N$_{2}$O and CO$_{2}$ emissions. We changed reduced tillage to conventional tillage or no tillage and performed two tillage operations in two growing seasons. All other parameters such as agricultural management, climate, and crop type at the study site, an intermediately aerated Luvisol in Belgium, were similar. Nitrous oxide and CO$_{2}$ emissions were measured event-directed about 40 times per year from September 2006 until December 2008 using a closed chamber technique. We did not observe any significant short-term effect of tillage intensity on N$_{2}$O emissions during the 2 years following tillage conversion. The 2-year aggregated N$_{2}$O emission was not affected by the absence of tillage, 5.6 kg N$_{2}$O–N ha$^{−1}$, compared to conventional tillage, 4.6 ± 0.9 kg N$_{2}$O–N ha$^{−1}$, or reduced tillage, 4.7 ± 0.3 kg N$_{2}$O–N ha$^{−1}$. Enhanced N$_{2}$O emission events in the absence of tillage, 1 year after conversion, could be explained by the combination of higher N application and wetter conditions. Conversion to conventional tillage caused a small, but significant, increase in CO$_{2}$ emission over the same period. We conclude that in the short term, none of the tillage intensities had an effect on N$_{2}$O emission, and the effect on CO$_{2}$ emission was slightly positive when tillage intensity increased. A low short-term risk of increased N$_{2}$O emission in the absence of tillage in well-aerated croplands is beneficial agro-environmentally, but the long-term effect should also be assessed via follow-up studies.
Starting Page	453
Ending Page	461
Page Count	9
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	31
Issue Number	3
e-ISSN	17730155
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-25
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tillage Nitrous oxide Emission WFPS Luvisol Sustainable Development Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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