Summary
This multi-site field study evaluated nitrogen use efficiency and N₂O emissions from five UK grasslands under different fertilisation regimes. The research found that urea-based fertilisers, particularly when combined with the nitrification inhibitor DCD (dicyandiamide), reduced N₂O emissions compared to ammonium nitrate (AN) or calcium ammonium nitrate (CAN). Total nitrogen input was correlated with nitrogen offtake and excess, whilst cumulative emissions and emission factors were related to yield-scaled emissions.
UK applicability
These findings are directly applicable to UK grassland management and policy, as they reflect actual UK field conditions across multiple sites and fertiliser products in use. The results support evidence-based fertiliser selection to reduce agricultural greenhouse gas emissions whilst maintaining productivity.
Key measures
Nitrogen use efficiency, nitrous oxide emissions, emission factors (EF), nitrogen offtake, nitrogen excess, yield-scaled emissions
Outcomes reported
The study measured nitrogen use efficiency and nitrous oxide (N₂O) emissions across five fertilised grasslands in the United Kingdom, and assessed how different nitrogen fertiliser types and additives affected both emissions and nutrient offtake.
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