Nitrogen availability, water-filled pore space, and N2O-N fluxes after biochar application and nitrogen fertilization.

• Autor(a) principal: CARVALHO, M. T. de M.
• Data de Publicação: 2016
• Outros Autores: MADARI, B. E., BASTIAANS, L., VAN OORT, P. A. J., LEAL, W. G. de O., SOUZA, D. M. de, SANTOS, R. C. dos, MATSUSHIGE, I., MAIA, A. de H. N., HEINEMANN, A. B., MEINKE, H.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1056600
• topic: Gas efeito estufa; Fluxo de gases; Nitrogênio; Solo; Porosidade; Sistema de cultivo; Condicionador do solo; Nitrato; Amonia

The objective of this work was to investigate the impact of the application of wood biochar, combined with N fertilizations, on N2O-N fluxes, nitrogen availability, and water-filled pore space (WFPS) of a clayey Oxisol under rice (wet season) and common bean (dry season) succession. Manual static chambers were used to quantify N2O-N fluxes from soil immediately after a single application of wood biochar (32 Mg ha-1) and after four crop seasons with N applications (90 kg ha-1 N). Soil ammonium (N-NH4 +) and nitrate (N-NO3-) availability, as well as WFPS, was measured together with N2O-N fluxes. There was no interaction between biochar and N fertilization regarding N2O-N fluxes in any of the four seasons monitored, although these fluxes were clearly enhanced by N applications. At 1.5 and 2.5 years after biochar application, the WFPS decreased. In addition, in the seasons characterized by low WFPS, N2O-N fluxes and soil N-NO3 - and N-NH4 + availability were enhanced after N applications. Long-term experiments in the field are important to quantify the impacts of biochar on N2O-N fluxes and to determine the dynamics of these fluxes on soil-related variables.