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Plant function and evolutionary biology
REVIEW

Unlocking the potential of biochar in the remediation of soils contaminated with heavy metals for sustainable agriculture

Zubaira Maqbool A B # , Muhammad Shahbaz Farooq https://orcid.org/0000-0002-8507-4011 A C # * , Anum Rafiq D , Muhammad Uzair https://orcid.org/0000-0001-8329-9762 E , Muhammad Yousuf F , Muhammad Ramzan Khan E and Shuhao Huo A *
+ Author Affiliations
- Author Affiliations

A School of Food Science and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.

B Department of Soil Science and Environmental Science, Arid Agriculture University, Rawalpindi, Pakistan.

C Rice Research Program, Crop Sciences Institute (CSI), National Agricultural Research Centre (NARC), Park Road, Islamabad 44000, Pakistan.

D Institute Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China.

E National Institute of Genomics and Advanced Biotechnology (NIGAB), National Agriculture Research Center (NARC), Park Road, Islamabad, Pakistan.

F Pakistan Agriculture Research Council (PARC), G5, Islamabad, Pakistan.

# These authors contributed equally to this paper

Handling Editor: Sajid Fiaz

Functional Plant Biology 51, FP23257 https://doi.org/10.1071/FP23257
Submitted: 2 November 2023  Accepted: 20 December 2023  Published: 5 February 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Agricultural soils contaminated with heavy metals (HMs) impose a threat to the environmental and to human health. Amendment with biochar could be an eco-friendly and cost-effective option to decrease HMs in contaminated soil. This paper reviews the application of biochar as a soil amendment to immobilise HMs in contaminated soil. We discuss the technologies of its preparation, their specific properties, and effect on the bioavailability of HMs. Biochar stabilises HMs in contaminated soil, enhance the overall quality of the contaminated soil, and significantly reduce HM uptake by plants, making it an option in soil remediation for HM contamination. Biochar enhances the physical (e.g. bulk density, soil structure, water holding capacity), chemical (e.g. cation exchange capacity, pH, nutrient availability, ion exchange, complexes), and biological properties (e.g. microbial abundance, enzymatic activities) of contaminated soil. Biochar also enhances soil fertility, improves plant growth, and reduces the plant availability of HMs. Various field studies have shown that biochar application reduces the bioavailability of HMs from contaminated soil while increasing crop yield. The review highlights the positive effects of biochar by reducing HM bioavailability in contaminated soils. Future work is recommended to ensure that biochars offer a safe and sustainable solution to remediate soils contaminated with HMs.

Keywords: bioavailability, environmental sustainability, plant growth, plant–soil interactions, soil fertility, soil health, soil pollution, sustainable agriculture.

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