Effect of goethite modified biochar on cadmium availability and transfer in the soil–rice system

Muhammad Kashif Irshad, Shang Jiangying*, Chenchong, Ali Noman, Muhammad Ibrahim.

College of Resource and Environmental Science. China Agriculture University Beijing, China.

kashifirshad771@yahoo.com

To date no information is available on impact of goethite biochar on Cd phytoavailability in Cd contaminated paddy soil. The main objective of current study was to investigate the effect of amending Cd contaminated soil with Biochar (BC) and Goethite coated Biochar (GB) at different rates on phytoavailability of Cd in rice plant. Goethite coated biochar can combine the benefits of biochar. The application of BC and GB reduced pore water Cd in the rhizosphere soil throughout the rice growth. GB amendments greatly enhance the Fe plaque formation on rice root, thus causing a decreased Cd accumulation in rice plant parts. GB amendments significantly reduced Cd concentration in rice roots and shoots. Sequential extraction results showed that BC and GB can enhance the transfer of exchangeable Cd to non exchangeable fractions thus decreasing the Cd mobility in paddy soils. GB increased the biomass of rice roots and shoots by increasing the chlorophyll content and gas exchange attributes. BC and GB application diminishes the oxidative stress in rice plant caused by Cd toxicity. The findings of the present study demonstrate that amending the soil with1.5% GB can be a potential remediation method to reduce accumulation of Cd in rice plants.

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