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Nitrous Oxide Emissions from Manure and Inorganic Fertilizers Applied to Spring Barley
Author(s) -
Petersen S. O.
Publication year - 1999
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1999.00472425002800050027x
Subject(s) - nitrous oxide , slurry , hordeum vulgare , nitrification , manure , agronomy , fertilizer , ammonium , denitrification , chemistry , nitrate , seeding , environmental science , ammonia volatilization from urea , liquid manure , ammonium nitrate , anaerobic digestion , moisture , nitrogen , poaceae , environmental engineering , methane , biology , organic chemistry
Nitrous oxide emissions from soil amended with untreated liquid manure (slurry), anaerobically digested slurry, or inorganic fertilizers (calcium ammonium nitrate or 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 with trail hose application 5 wk after seeding. In the second year all fertilizers were applied before seeding, while soil moisture and initial NO − 3 availability was varied. Accumulated N 2 O losses between the time of fertilization and ca. 1 July represented 0.14 to 0.35% of total N in 1996 and 0.34 to 0.64% in 1997. In both years the highest N 2 O emissions were observed with untreated slurry, whereas digested slurry and inorganic fertilizers were at a similar level. Increasing the soil moisture content or NO − 3 availability had no significant effect on accumulated N 2 O losses. Although metabolizable C may thus have stimulated N 2 O emissions via denitrification from untreated slurry, the largest contribution to N 2 O fluxes probably came from nitrification with all fertilizer types. Using the IPCC guidelines it was estimated that anaerobic digestion of slurry per se could potentially reduce N 2 O emissions from Danish agriculture by 1.2 to 2.5%.