Nitrogen fluxes from irrigated common-bean as affected by mulching and mineral fertilization.

The objective of this work was to measure the fluxes of N2O-N and NH3-N throughout the growing season of irrigated common-bean (Phaseolus vulgaris), as affected by mulching and mineral fertilization. Fluxes of N2O-N and NH3-N were evaluated in areas with or without Congo signal grass mulching (Urochloa ruziziensis) or mineral fertilization. Fluxes of N were also measured in a native Cerrado area, which served as reference. Total N2O-N and NH3-N emissions were positively related to the increasing concentrations of moisture, ammonium, and nitrate in the crop system, within 0.5 m soil depth. Carbon content in the substrate and microbial biomass within 0.1 m soil depth were favoured by Congo signal grass and related to higher emissions of N2O-N, regardless of N fertilization. Emission factors (N losses from the applied mineral nitrogen) for N2O-N (0.01-0.02%) and NH3-N (0.3-0.6%) were lower than the default value recognized by the Intergovernmental Panel on Climate Change. Mulch of Congo signal grass benefits N2O-N emission regardless of N fertilization.

Bibliographic Details

Main Authors:	CARVALHO, M. T. de M., MADARI, B. E., LEAL, W. G. de O., COSTA, A. R. da, MACHADO, P. L. O. de A., SILVEIRA, P. M. da, MOREIRA, J. A. A., HEINEMANN, A. B.
Other Authors:	MARCIA THAIS DE MELO CARVALHO, CNPAF; BEATA EMOKE MADARI, CNPAF; WESLEY GABRIEL DE OLIVEIRA LEAL, CNPAF; ADRIANA RODOLFO DA COSTA, UEG; PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPAF; PEDRO MARQUES DA SILVEIRA, CNPAF; JOSE ALOISIO ALVES MOREIRA, CNPMS; ALEXANDRE BRYAN HEINEMANN, CNPAF.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2013-08-22
Subjects:	Óxido nitroso., Feijão, Phaseolus vulgaris, Brachiaria, Plantio direto, Cobertura morta, Cerrado, Nitrogênio, Óxido, Efeito estufa, Fertilidade do solo, Mudança Climática.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/964556
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