What is the effect of different slurry application techniques on nitrous oxide emissions in grassland?

In addition to NH₃ emissions (Nyameasem et al. 2022) after slurry application, nitrous oxide emissions from different application techniques in grassland were also investigated. Slurry was applied by trailing shoe technique (with/without acidification) or by slot injection (with/without addition of a nitrification inhibitor). Over a 2-year period, nitrous oxide emissions were studied using manual chamber measurements. Across all years and sites, N₂O emissions varied between 0.1 and 2.9 kg N ha/year. Although nitrous oxide emissions were highly variable in time and space, there were no differences among the application techniques studied. An expected increase in N₂O emissions due to the use of slot injection was not confirmed. Also, benefits in terms of N efficiency and N₂O mitigation by using the nitrification inhibitor were not found. In addition to the evaluation of emissions, the yield results of the study show that slurry injection in grassland is also possible without yield loss.

https://doi.org/10.1111/gfs.12612