Summary
This field-based study develops and evaluates a biological mitigation technology for farmland N₂O emissions using the N₂O-respiring bacterium Cloacibacterium sp. CB-01, delivered via biogas production waste as a substrate vector. Field trials across different soil types demonstrated substantial N₂O reductions (50–95%), attributed primarily to bacterial persistence in soil rather than superior biokinetic parameters. Scaled to the European level, this approach could reduce anthropogenic N₂O emissions by 5–20%, offering a cost-effective option where conventional mitigation strategies are limited.
UK applicability
The findings are potentially applicable to UK farming systems, as field trials were conducted in European conditions and the technology uses waste substrates readily available in European biogas industries. However, soil-type-dependent effectiveness (50–95% variation) suggests UK-specific field validation would be needed to optimise performance across the range of soil conditions encountered in British agriculture.
Key measures
N₂O emission reductions (percentage decrease by soil type); bacterial cell density (approximately 6 × 10⁹ cells per millilitre); bacterial survival persistence in soil; biokinetic parameters of N₂O-respiring strains; potential national and European-level emission reductions
Outcomes reported
The study measured N₂O emission reductions following soil inoculation with Cloacibacterium sp. CB-01, a N₂O-respiring bacterium grown in biogas production waste. Field experiments demonstrated 50–95% reductions in N₂O emissions depending on soil type, with potential to reduce European anthropogenic N₂O emissions by 5–20% at scale.
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