Summary
Agricultural soils are a major source of nitric- (NO) and nitrous oxide (N<sub>2</sub>O), which are produced and consumed by biotic and abiotic soil processes. The dominant sources of NO and N<sub>2</sub>O are microbial nitrification and denitrification, and emissions of NO and N<sub>2</sub>O generally increase after fertiliser application. The present study investigated the impact of N-source distribution on emissions of NO and N<sub>2</sub>O from soil and the significance of denitrification, rather than nitrification, as a source of NO emissions. To eliminate spatial variability and changing environmental factors which impact processes and results, the experiment was conducted under highly controlled conditions. A laboratory incubation system (DENIS) was used, allowing simultaneous measu
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