How Effective is Reduced Tillage–Cover Crop Management in Reducing N2O Fluxes from Arable Crop Soils?

摘要: Field management is expected to influence nitrous oxide (N2O) production from arable cropping systems through effects on soil physics and biology. Measurements of N2O flux were carried out a weekly basis April 2008 August 2009 for spring sown barley crop at Oak Park Research Centre, Carlow, Ireland. The was free draining sandy loam typical the majority cereal growing land in aims this study investigate suitability combining reduced tillage mustard cover (RT–CC) mitigate emissions soils validate DeNitrification–DeComposition (DNDC) model version (v. 9.2) estimating emissions. In addition, used simulate two sets future climate scenarios (period 2021–2060). results showed that although daily significantly higher RT–CC occasions (p 0.05) cumulative flux, compared with CT treatment, found. DNDC validated using data collected combination previously shown be suitable (r 2 = 0.70), water-filled pore space (WFPS) 0.58) temperature 0.87) field. relative deviations simulated measured values 140 kg N ha−1 fertiliser application rate −36 % −19 CT. Root mean square error 0.014 0.007 N2O–N day−1, respectively, indicating reasonable fit. Future fluxes total denitrification predicted increase under all projections, whilst predictions inconsistent Our suggests use as an alternative farm system barley, if sole objective reduce emissions, may not successful.