SciELO - Scientific Electronic Library Online

 
vol.51 issue9Organic matter and soil aggregation after the conversion of "murundu fields" into a no-tillage systemNitrogen oxides and CO2 from an Oxisol cultivated with corn in succession to cover crops author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

CARVALHO, Márcia Thaís de Melo et al. Nitrogen availability, water-filled pore space, and N2O-N fluxes after biochar application and nitrogen fertilization. Pesq. agropec. bras. [online]. 2016, vol.51, n.9, pp.1203-1212. ISSN 0100-204X.  https://doi.org/10.1590/s0100-204x2016000900020.

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.

Keywords : cropping systems; gas fluxes; greenhouse gases; nitrate and ammonium; soil amendment; soil porosity.

        · abstract in Portuguese     · text in English     · English ( pdf )