New Insights into the Use of Rhizobia to Mitigate Soil N 2 O Emissions

Catherine Hénault, Elodie Barbier, Alain Hartmann and Cécile Revellin
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Catherine Hénault: Agroécologie, INRAE, Institut Agro, Université Bourgogne, Université Bourgogne Franche-Comté, F-21000 Dijon, France
Elodie Barbier: Agroécologie, INRAE, Institut Agro, Université Bourgogne, Université Bourgogne Franche-Comté, F-21000 Dijon, France
Alain Hartmann: Agroécologie, INRAE, Institut Agro, Université Bourgogne, Université Bourgogne Franche-Comté, F-21000 Dijon, France
Cécile Revellin: Agroécologie, INRAE, Institut Agro, Université Bourgogne, Université Bourgogne Franche-Comté, F-21000 Dijon, France

Agriculture, 2022, vol. 12, issue 2, 1-12

Abstract: Agriculture is a major anthropogenic source of the greenhouse gas N 2 O, which is also involved in stratospheric ozone depletion. While the use of rhizobial inoculants has already been reported as an emerging option for mitigating soil N 2 O emissions, this study presents an in situ abatement of 70% of soil N 2 O emission using the strain nosZ + G49 vs. nosZ − USDA138 in association with soybean. Therefore, we consider that the choice of the inoculant strain of a leguminous crop should take into account the capacity of strains to reduce nitrous oxide in addition to their N fixation capacity. This study also clearly suggests that this mitigation option could be considered not only for soybean but also for different leguminous crops, with emphasis currently placed on lupin because of the potential of its association with the nosZ + LL200 strain. The clear demonstration of the N 2 O reduction capacity of clover symbiotic strains suggests that opportunities for mitigation might also occur on grassland.

Keywords: N 2 O mitigation; rhizobia; legumes; nosZ gene; phenotypes; multiscale approach (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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