Nitrous Oxide Emissions from Manure and Inorganic Fertilizers Applied to Spring Barley

摘要: Nitrous oxide emissions from soil amended with untreated liquid manure (slurry), anaerobically digested slurry, or inorganic fertilizers (calcium ammonium nitrate urea) were quantified in a field study covering two growth seasons of spring barley (Hordeum vulgare L.). In the first year incorporation before seeding was compared trail hose application 5 wk after seeding. second all applied seeding, while moisture and initial NO 3 - availability varied. Accumulated N 2 O losses between time fertilization ca. 1 July represented 0.14 to 0.35% total 1996 0.34 0.64% 1997. both years highest observed whereas slurry at similar level. Increasing content had no significant effect on accumulated losses. Although metabolizable C may thus have stimulated via denitrification largest contribution fluxes probably came nitrification fertilizer types. Using IPCC guidelines it estimated that anaerobic digestion per se could potentially reduce Danish agriculture by 1.2 2.5%.