Authors: Fatima Haque, Rafael M. Santos, Yi Wai Chiang
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Regular Sessions
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Description: Agricultural soil offers a large natural sink to store CO2, a major greenhouse gas, and its concentration in the atmosphere is increasing continuously, hence there is an urgent need to reduce its level in the atmosphere. In this study, inorganic carbon sequestration in soil is accomplished by adding alkaline-earth silicate, wollastonite, to sequester CO2 via the geochemical route of mineral carbonation.
Two leguminous plants frequently used in agricultural sector: soybean and alfalfa were grown in wollastonite amended soil, with different wollastonite dosages, for a duration of 14 weeks in a microplot experiment in Ontario, Canada. The growth performance of the plants were determined in terms of above-ground biomass dry weight, root biomass, stem width, leaf blade width, and plant height. For soybean, the weight of the pods was also measured to determine the effect on the yield. The second objective was to find evidence of enhanced weathering of wollastonite in soil. In addition to determining the inorganic carbon content in the soil, mineralogical assessment of the soils was performed using XRD and SEM analysis.
Soybean yield increased by two-fold in the plot amended with 10 kg?m-2 wollastonite, and alfalfa showed increased growth at all dosages of wollastonite. CO2 sequestration of 0.3 kg CO2?m-2 was achieved. XRD and SEM-EDS analyses indicated accumulation of calcite in wollastonite-amended soil and formation of other weathering products. The results obtained from this study help to understand the impact of wollastonite soil amendment on agronomy, and will aid in implementing such negative emissions technology.
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: GHG Emissions, Climate Change & Adaptation 1
Publication type: Presentation
Language 1: en
Rights: Canadian Society for Bioengineering