Produção Nacional
Revisado por pares
Nitrogen fluxes from irrigated common‑bean as affected by mulching and mineral fertilization
2013; Embrapa Informação Tecnológica; Volume: 48; Issue: 5 Linguagem: Inglês
10.1590/s0100-204x2013000500003
ISSN1678-3921
AutoresM. T. de M. Carvalho, B. E. Madari, Wesley Gabriel de Oliveira Leal, Adriana Rodolfo da Costa, P. L. O. A. Machado, Pedro Marques da Silveira, José Aloísio Alves Moreira, Alexandre Bryan Heinemann,
Tópico(s)Growth and nutrition in plants
ResumoThe 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.
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