N2O flux measurements over an irrigated maize crop: A comparison of three methods

•Eddy covariance, and automated and static chamber methodologies are compared.•N2O fluxes measured at different scales agree in temporal dynamics.•Methods agree in magnitude dynamics in the highest and lowest ranges of N2O fluxes.•EC methodology still needs to be enhanced to reduce the high variability and uncertainty in the near background N2O fluxes.•Chamber-related environment perturbation biased the measured N2O fluxes.