Effect of six engineered biochars on greenhouse gas emissions from a loamy sand and a silt loam

Authors: Brassard, Patrick; Godbout, Stéphane
Description: Biochar produced from the pyrolysis of agricultural and forest biomasses have the potential to sequester carbon in soil and to reduce greenhouse gas (GHG) emissions. The goal of this research study was to evaluate the effect of engineered biochars produced from the pyrolysis of agricultural and forest biomasses on soil properties and GHG emissions. A 45-days incubation study was carried out, in which two types of soil (loamy sand and silt loam) were mixed with six different engineered biochars at a dose of 2% in 1 liter jars. The engineered biochars were produced from woody biomass, switchgrass and the solid fraction of pig manure (SFPM) in a vertical auger reactor using different pyrolysis operating parameters determined in previous experiments. At the beginning of the incubation, soil moisture content was adjusted at 80% WFPS (water-filled pore space) with a solution of ammonium nitrate that corresponds to a dose of 170 kg of nitrogen per hectare. Gas samples were taken to monitor N2O and CO2 emissions on the first three days, and then weekly. When compared to control (soil without biochar), N2O emissions decreased only in the silt loam amended with wood and switchgrass biochar; these four biochar treatment showed a high C/N ratio (> 30). Biochar produced from wood at high temperature (644
Keywords: Pyrolysis, Biochar, Soil, Greenhouse gas emissions
Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Session 2B: Soil & Water: Mitigating Environmental Impact
Publisher: Canadian Society for Bioengineering
Date: 2017-08-07
Publication type:
  • Technical conference
Type: Text.Article
Format: PDF
Identifier: CSBE17055
Coverage: Canada
Language 1: en
Rights: Canadian Society for Bioengineering

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