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Examining the potential for climate change mitigation from zero tillage

Mangalassery, S.; Sjögersten, Sofie; Sparkes, D.L.; Mooney, Sacha J.

Authors

S. Mangalassery

Sofie Sjögersten

D.L. Sparkes

Sacha J. Mooney



Abstract

The benefits of reduced and zero-tillage systems have been presented as reducing runoff, enhancing water retention and preventing soil erosion. There is also general agreement that the practice can conserve and enhance soil organic carbon (C) levels to some extent. However, their applicability in mitigating climate change has been debated extensively, especially when the whole profile of C in the soil is considered, along with a reported risk of enhanced nitrous oxide (N2O) emissions. The current paper presents a meta-analysis of existing literature to ascertain the climate change mitigation opportunities offered by minimizing tillage operations. Research suggests zero tillage is effective in sequestering C in both soil surface and sub-soil layers in tropical and temperate conditions. The C sequestration rate in tropical soils can be about five times higher than in temperate soils. In tropical soils, C accumulation is generally correlated with the duration of tillage. Reduced N2O emissions under long-term zero tillage have been reported in the literature but significant variability exists in the N2O flux information. Long-term, location-specific studies are needed urgently to determine the precise role of zero tillage in driving N2O fluxes. Considering the wide variety of crops utilized in zero-tillage studies, for example maize, barley, soybean and winter wheat, only soybean has been reported to show an increase in yield with zero tillage (7·7% over 10 years). In several cases yield reductions have been recorded e.g. c. 1–8% over 10 years under winter wheat and barley, respectively, suggesting zero tillage does not bring appreciable changes in yield but that the difference between the two approaches may be small. A key question that remains to be answered is: are any potential reductions in yield acceptable in the quest to mitigate climate change, given the importance of global food security?

Journal Article Type Article
Publication Date Sep 30, 2015
Journal Journal of Agricultural Science
Print ISSN 0021-8596
Electronic ISSN 1469-5146
Publisher Cambridge University Press (CUP)
Peer Reviewed Peer Reviewed
Volume 153
Issue 7
APA6 Citation Mangalassery, S., Sjögersten, S., Sparkes, D., & Mooney, S. J. (2015). Examining the potential for climate change mitigation from zero tillage. Journal of Agricultural Science, 153(7), https://doi.org/10.1017/S0021859614001002
DOI https://doi.org/10.1017/S0021859614001002
Publisher URL https://www.cambridge.org/core/journals/journal-of-agricultural-science/article/examining-the-potential-for-climate-change-mitigation-from-zero-tillage/7248675D2F3E3FFEBB3DFB2379790E6C
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © Cambridge University Press 2015

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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