Summary
This laboratory study evaluated the relative efficacy of two plant-derived fatty acids (linoleic and linolenic acid) as biological nitrification inhibitors compared to the synthetic inhibitor dicyandiamide in a highly nitrifying soil. The research provides mechanistic evidence on whether these fatty acids suppress nitrifier activity and reduce reactive nitrogen losses, contributing to understanding of natural rhizosphere processes that could inform nitrogen management strategies. Findings may have implications for developing alternative, plant-based approaches to mitigate nitrogen losses and associated greenhouse gas emissions in agricultural systems.
UK applicability
The findings are relevant to UK agricultural practice, particularly for managing nitrogen fertiliser efficiency and reducing nitrous oxide emissions from soils—a priority under climate and water quality regulations. However, as a laboratory study on a single soil type, field validation under UK climate and soil conditions would be needed before recommending biological inhibitors as practical alternatives to synthetic products.
Key measures
Nitrification rates, nitrate concentrations, nitrous oxide emissions, nitrifier enzyme activity, stability of inhibitor effects over time
Outcomes reported
The study compared the effectiveness of plant-derived fatty acids (linoleic and linolenic acid) with the synthetic nitrification inhibitor dicyandiamide in suppressing soil nitrification rates and nitrous oxide emissions. Measurements included nitrifier activity, nitrate production, and apparent inhibition mechanisms in a highly nitrifying soil under controlled laboratory conditions.
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