Gaseous nitrogen losses from pig slurry fertilisation: can they be reduced with additives in a wheat crop?

Aim of the study: The use pig slurry as fertiliser is associated with gaseous nitrogen (N) losses, especially ammonia (NH3) and nitrous oxide (N2O), leading to environmental problems a reduction its value. This study evaluates, in an irrigated wheat crop, effect different additives mixed decrease NH3 N2O losses.Area Middle Ebro valley, SpainMaterials methods: treatments were: i) non-N-fertilised control, ii) (PS), iii) urease inhibitor monocarbamide dihydrogen sulphate (PS-UI), iv) microbial activator development (PS-A), v) nitrification 3,4-dimethylpyrazole phosphate (PS-NI). Pig was applied at target rate 120 kg NH4+-N ha-1. Ammonia volatilisation measured using semi-opened static chambers after application presowing 2016 side-dressing 2017. Nitrous emissions were closed 2017 2018 side-dressing.Main results: estimated be 7-9% 19-23% applications, respectively. Additives not able reduce any moment. PS-NI only treatment being effective reducing emissions, 70% respect those PS treatment. Crop yield parameters affected by because no controlling losses low contribution N balance (<1 N2O-N ha-1).Research highlights: would recommended from perspective, although without grain benefits.