Nitrous oxide emissions from ruminant urine: science and mitigation for intensively managed perennial pastures

Summary

This narrative review examines the biogeochemical mechanisms driving elevated nitrous oxide emissions from ruminant urine deposited in intensively managed perennial pasture systems, synthesising recent evidence on soil microbial processes and urine patch dynamics. The authors evaluate practical mitigation strategies to reduce this localized but potent climate impact pathway, addressing a substantive gap in understanding a significant greenhouse gas source in high-intensity pastoral livestock production. The review integrates evidence on both the drivers of N₂O formation in concentrated nitrogen hotspots and feasible on-farm interventions to mitigate this emissions source.

UK applicability

United Kingdom dairy and sheep production systems, particularly intensive perennial ryegrass pastures, are directly affected by urine patch N₂O emissions; findings are likely applicable to UK grazing management and climate mitigation policy given the prevalence of similar pastoral systems. The mitigation strategies evaluated may be relevant to UK farm practice and environmental regulation, though site-specific soil and climate conditions will influence implementation effectiveness.

Key measures

Nitrous oxide (N₂O) flux rates from urine patches; urine patch biogeochemistry; soil microbial nitrification and denitrification processes; mitigation intervention effectiveness

Outcomes reported

The narrative review synthesises mechanisms of N₂O emissions from ruminant urine patches in intensive perennial pasture systems and evaluates practical mitigation interventions. It integrates evidence on urine patch biogeochemistry, soil microbial processes, and localized greenhouse gas fluxes from high-concentration nitrogen deposition.

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