Summary
This 2025 laboratory study examined how deliberately applied functional microbial inoculants alter the balance between dissimilatory nitrate reduction to ammonium (DNRA)—a nitrogen-conserving pathway—and denitrification—a nitrogen-losing pathway—in compost-amended soil. The research suggests that inoculant composition can be engineered to favour either pathway, with potential implications for optimising soil nitrogen retention and reducing gaseous losses in agricultural systems. Full text consultation is required to establish effect magnitudes, soil conditions tested, and agronomic relevance.
UK applicability
Findings on microbial inoculant design for nitrogen pathway modulation may be relevant to UK organic and regenerative farming systems incorporating compost amendments, though UK soil conditions, temperatures, and compost types may differ from those tested. Applicability depends on whether the study conditions reflect UK temperate soils and climate.
Key measures
Pathway balance between DNRA and denitrification; likely measures include nitrous oxide and dinitrogen gas production, ammonium accumulation, abundance or expression of functional genes (narG, nirS, nrfA or similar), and potentially microbial community composition.
Outcomes reported
The study measured shifts in the relative activity of dissimilatory nitrate reduction to ammonium (DNRA) versus denitrification pathways in response to different functional microbial inoculant compositions applied to compost-amended soil. Outcomes likely included quantification of nitrogen gas losses, ammonium retention, and gene expression or enzyme activity markers associated with each pathway.
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