Targeted technologies for nitrous oxide abatement from animal agriculture

摘要: Nitrous oxide (N2O) emissions account for ~10% of global greenhouse gas (GHG) emissions, with most these (~90%) deriving from agricultural practices. Animal agriculture potentially contributes up to 50% total N2O emissions. In intensive animal agriculture, high emission rates generally coincide anaerobic soil conditions and NO3–, primarily urine patches. This paper provides an overview animal, feed-based or management abatement technologies ruminant targeted at reducing the size NO3– pool improving aeration. Direct measurements potential intervention are scarce. However, studies have shown that they reduce urinary N excretion by 3–60% thus associated Research on effect water interventions is further advanced reduction potentials 90% been measured in some instances. Of currently available technologies, nitrification inhibitors, managing diets fertiliser show best short-term. strategies should always be evaluated a whole-system context, ensure reductions one part system do not stimulate higher elsewhere. Current reviewed here could deliver housing system, but only 15% grazing-based system. given enteric methane form majority grazing systems, likely translate 2–4% decrease GHG farm scale. Clearly, research needed develop cycling production systems.