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ASSESSING BIOCHAR APPLICATION TO IMMOBILIZE CD AND PB IN A CONTAMINATED SOIL: A FIELD EXPERIMENT UNDER A CUCUMBER-SWEET POTATO-RAPE ROTATION
Jiang, S., J. Liu, J. Wu, G. Dai, D. Wei, and Y. Shu.
Environmental Geochemistry and Health [Published online 23 April 2020 prior to print]
Litchi branch biochar (BC) was used to stabilize Cd- and Pb-contaminated agricultural soil near Dabaoshan Mine in South China during a cucumber-sweet potato-rape crop rotation over one year. BC was pyrolyzed at 600°C and applied at four rates [(0 t/ha (T0), 10 t/ha (T1), 20 t/ha (T2), and 30 t/ha (T3)]). Results showed that BC application increased the pH, cation exchange capacity, and soil organic matter. After the cultivation of crops, pH decreased gradually, with the biggest drop of 0.45 pH units in T3 treatment after rape cultivation. BC application increased the yield of three crops up to onefold to twofold in T3 treatment as compared to the control. The uptake of Cd and Pb in all three crops decreased with the increase in BC doses, which was related to the decrease in bioavailable metals in their respective soil treatments.
Environmental Geochemistry and Health [Published online 23 April 2020 prior to print]
Litchi branch biochar (BC) was used to stabilize Cd- and Pb-contaminated agricultural soil near Dabaoshan Mine in South China during a cucumber-sweet potato-rape crop rotation over one year. BC was pyrolyzed at 600°C and applied at four rates [(0 t/ha (T0), 10 t/ha (T1), 20 t/ha (T2), and 30 t/ha (T3)]). Results showed that BC application increased the pH, cation exchange capacity, and soil organic matter. After the cultivation of crops, pH decreased gradually, with the biggest drop of 0.45 pH units in T3 treatment after rape cultivation. BC application increased the yield of three crops up to onefold to twofold in T3 treatment as compared to the control. The uptake of Cd and Pb in all three crops decreased with the increase in BC doses, which was related to the decrease in bioavailable metals in their respective soil treatments.
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