Assessing biochar ecotoxicology for soil amendment by root phytotoxicity bioassays

Environmental Monitoring and Assessment
Giovanna VisioliT Vamerali

Abstract

Soil amendment with biochar has been proposed as effective in improving agricultural land fertility and carbon sequestration, although the characterisation and certification of biochar quality are still crucial for widespread acceptance for agronomic purposes. We describe here the effects of four biochars (conifer and poplar wood, grape marc, wheat straw) at increasing application rates (0.5, 1, 2, 5, 10, 20, 50% w/w) on both germination and root elongation of Cucumis sativus L., Lepidium sativum L. and Sorghum saccharatum Moench. The tested biochars varied in chemical properties, depending on the type and quality of the initial feedstock batch, polycyclic aromatic hydrocarbons (PAHs) being high in conifer and wheat straw, Cd in poplar and Cu in grape marc. We demonstrate that electrical conductivity and Cu negatively affected both germination and root elongation at ≥5% rate biochar, together with Zn at ≥10% and elevated pH at ≥20%. In all species, germination was less sensitive than root elongation, strongly decreasing at very high rates of chars from grape marc (>10%) and wheat straw (>50%), whereas root length was already affected at 0.5% of conifer and poplar in cucumber and sorghum, with marked impairment in all chars at >...Continue Reading

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Citations

Mar 8, 2017·Environmental Science and Pollution Research International·Yang LiYaodong Hu
Dec 21, 2017·Environmental Science and Pollution Research International·Federica D ContiCristina Menta
Jan 1, 2018·Communications in Soil Science and Plant Analysis·David M OlszykMark G Johnson
Oct 18, 2018·Bulletin of Environmental Contamination and Toxicology·Michel David GerberÉrico Kunde Correa
Nov 15, 2020·Journal of Environmental Management·Silvia CellettiTanja Mimmo
May 16, 2019·The Science of the Total Environment·Danielle L GelardiSanjai J Parikh
Jul 17, 2021·Journal of Hazardous Materials·Ling XiangXiaofei Tan
Oct 8, 2021·Environmental Science and Pollution Research International·Lulu KongXizhao Tian

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