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ABSTRACT
Biosolid-borne heavy metals are the main concern in soils. Therefore, the effects of biosolid biochar application in soils were evaluated in our study through a rice-wheat rotation in fields. The results showed that after the application of biosolid biochar, soil organic matter (SOM), soil pH, and soil total heavy metal concentrations (Cd, Zn, Cu, and Pb) were significantly increased. But the CaCl2 extracted metals concentrations were decreased, and no significant differences in metal concentrations of soil deeper layers (20–100 cm) were found among different treatments. The Cd, Zn, Cu, and Pb concentrations in rice decreased by 13.2%, 37.0%, 9.92%, and 63.0%, respectively, and the concentrations of Cd, Zn, Cu, and Pb in wheat decreased by 20.85%, 19.7%, 48.6%, and 23.6%, respectively, compared with the control treatment. Biosolid biochar can decrease metal availability in soils and increase crop production in fields, thus is suggested to use in fields.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Authors contribution
All authors provided support and contributions to the conception and design of this article. All authors read and approved the final manuscript. Yonghua Liu: Conceptualization, Methodology, Data curation, Writing the original draft; Jing Wu: Conceptualization, Methodology, Writing review & editing; Guoqiang Liu: Data curation, Writing review & editing; Jialing Zhang: Writing review & editing; Haidong Li: Writing review & editing.