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| Titel |
N2O emission from organic barley cultivation as affected by green manure treatment |
| VerfasserIn |
S. Nadeem, S. Hansen, M. Bleken, P. Dörsch |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069441
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| Zusammenfassung |
| Legumes are an important source of nitrogen in stockless organic cereal production.
However, substantial amounts of N can be lost from legume-grass leys prior to or after
incorporation as green manure (GM). Here we report N2O emissions from a field experiment
in SE Norway exploring different green manure management strategies: mulching versus
removal of grass-clover herbage during a whole growing season and replacement as biogas
residue to a subsequent barley crop. Grass-clover ley had significantly higher N2O emissions
as compared with a non fertilized cereal reference during the GM year (2009).
Mulching of herbage induced significantly more N2O emission (+ 0.37 kg N2O-N
ha-1) throughout the growing season than removing herbage. In spring 2010, all
plots were ploughed (with and without GM) resulting in generally higher N2O
emissions during barley production. Addition of biogas residue (80 kg N ha-1) in
2010 to previously non mulched GM and unfertilized cereal plots (2009) had no
significant effect on cumulative N2O emissions relative to a treatment receiving the same
amount of N in form of mulched aboveground GM. Ley management (mulching vs.
removing biomass in 2009) had no effect on N2O emissions during barley production
in 2010. In general, organic amendments (previously mulched or harvested GM,
biorest) increased N2O emissions relative to a reference treatment with low mineral N
fertilisation (80 kg N ha-1). Organic cereal production emitted 95 g N2O-N kg-1 N
yield in barley grain, which was substantially higher than in the reference treatment
with 80 kg mineral N fertilization in 2010 (47 g N2O-N kg-1 N yield in barley
grain). |
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