Author(s): CARVALHO, M. T. de M.; 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.

Summary: 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.

Publication year: 2016

Types of publication: Journal article

Unit: Embrapa Rice & Beans

Keywords: Amonia, Condicionador do solo, Fluxo de gases, Gas efeito estufa, Gas fluxes, Nitrate and ammonium, Nitrato, Nitrogênio, Porosidade, Sistema de cultivo, Soil porosity, Solo