Delgado JA, Del Grosso SJ, Ogle SM. 2010. 15N isotopic crop residue cycling studies and modeling suggest that IPCC methodologies to assess residue contributions to N2O-N emissions should be reevaluated. Nutrient Cycling in Agroecosystems 86: 383-390.
These authors reanalyzed two recent reviews of measuring nitrous oxide emissions from agricultural systems and used a model to simulate N2O emissions and NO3 leaching associated with cropping practices in Colorado and Iowa. In general, use of crop residue instead of or in addition to synthetic fertilizers significantly altered patterns of N loss, whereas IPCC recommendations assume no difference between these N sources in regards to N2O emissions. Microbial immobilization of nitrogen, particularly associated with residues with high C/N ratios, is a major factor in these differences, and these authors provide supporting arguments for their suggestion of revisions to IPCC recommendations and modeling.
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