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Titre :
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Effects of type and amount of applied nitrogen fertilizer on nitrous oxide fluxes from intensively managed grassland
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Auteurs :
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G. Velthof ;
O. Oenema ;
R. Postma ;
M. Van Beusichem
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Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p. 257-267
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Langues:
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= Anglais
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Catégories :
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DECHETS
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Mots-clés:
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N2O
;
SOL
;
DENITRIFICATION
;
NITRIFICATION
;
PRAIRIE
;
FERTILISANT
;
AZOTE
;
DEJECTIONS ANIMALES
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Résumé :
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Five field experiments and one greenhouse experiment were carried out to assess the effects of nitrogen (N) fertilizer type and the amount of applied N fertilizer on nitrous oxide (N2O) emission from grassland. During cold and dry conditions in early spring, emission of N2O from both ammonium (NH4+) and nitrate (NO3-) containing fertilizers applied to a clay soil were relatively small, i.e. less than 0.1% of the N applied. Emission of N2O and total denitrification losses from NO3containing fertilizers were large after application to a poorly drained sand soil during a wet spring. A total of 5-12% and 8-14% of the applied N was lost as N2O and via denitrification, respectively. Emissions of N2O and total denitrification losses from NH4+ fertilizers and cattle slurry were less than 2% of the N applied. Addition of the nitrification inhibitor dicyandiamide (DCD) reduced N2O fluxes from ammonium sulphate (AS). However, the effect of DCD to reduce total N2O emission from AS was much smaller than the effect of using NH4+ fertilizer instead of NO3- fertilizer, during wet conditions.
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Source :
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Nutrient Cycling in Agroecosystems, vol.46
|
