Título:	Nitrogen fluxes from irrigated common-bean as affected by mulching and mineral fertilization.
Autoria:	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.
Afiliação:	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.
Ano de publicação:	2013
Referência:	Pesquisa Agropecuária Brasileira, v. 48, n. 5, p. 478-486, maio 2013.
Conteúdo:	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.
Thesagro:	Feijão Phaseolus vulgaris Brachiaria Plantio direto Cobertura morta Cerrado Nitrogênio Óxido Efeito estufa Fertilidade do solo Mudança Climática
Palavras-chave:	Óxido nitroso
ISSN:	0100-204X
Digital Object Identifier:	10.1590/S0100-204X2013000500003
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPAF)