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Description: Globally, the use of wastewater for irrigation is increasing due to scarcity of freshwater. Wastewater, especially in developing countries, contains Cd and Zn at toxic levels. The presence of Cd and Zn in food chain, can cause serious health problems. In a previous study, plantain peel biochar (PPB) significantly reduced the uptake of Cd and Zn in potato tubers by 69% and 33%, respectively (p<0.05). Therefore, this study investigated the effect of PPB on the uptake of Cd and Zn in spinach leaves irrigated with wastewater. Six PVC lysimeters (1.0 m x 0.45 m) were packed with sandy soil, and mixed with 1% PPB (w/w) at the top 0.1 m. Spinach was transplanted, followed by the application of inorganic fertilizers (21-0-0 and 0-0-61). Synthetic wastewater was applied every10 days (7.2 mm d-1 for 4 irrigations). Spinach leaves were harvested, thoroughly washed, oven dried (60oC for 2 d), digested, and analysed with ICP-MS for Cd and Zn. The results showed that Cd and Zn were taken up by spinach leaves in both PPB treatment and control (without PPB). Biochar amendment did not show significant effect on the uptake of Cd and Zn (p>0.05). The effect of biochar on heavy metal uptake could vary from plant to plant. Therefore, the crop type is a key factor influencing the decision of adding biochar as an amendment to soils irrigated with wastewater.

Keywords: spinach, plantain peel biochar, synthetic wastewater, irrigation, sandy soil
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Date: 2017-08-07
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Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Poster Session

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Type: Text.Article
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Publication type: Technical conference
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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