Nitric oxide and nitrous oxide emissions from cattle-slurry and mineral fertiliser treated with nitrification inhibitor to an agricultural soil: A laboratory approach

摘要

The application of organic and mineral fertilisers to soil can result in increased gaseous emissions to the atmosphere such asnitric oxide (NO) and nitrous oxide (N2O) gases. The aim of this study was to evaluate under laboratory conditions the effects onmineral N dynamics and NO and N2O emissions of application to soil of cattle slurry derived liquid fraction (LF) obtained by screwpress and mineral fertiliser (MF), both treated with or without the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP).An aerobic laboratory incubation was performed over 93 days with a Dystric Cambisol amended with mechanically separated LFor mineral fertiliser ammonium sulphate only or combined with DMPP. Two additional treatments were included: soil only and soilamended with DMPP. Nitrogen immobilisation was the dominant process with MF amendment, whereas N mineralisation has beenobserved with LF. The application of LF reduced significantly NO emissions by 80% relative to mineral but no differences wereobserved with N2O emissions. The addition of DMPP to MF induced a decrease of 18 and 29% in NO and N2O emissions whereasDMPP combined with LF reduced (numerically but not statistically) these emissions in 20 and 10%, respectively. Results obtainedin our study suggest that N (NO + N2O) losses can be mitigated by adding DMPP to mineral fertilisers or replacing mineral fertiliserby LF.