ENVIRONMENTAL RISKS OF BIOCHAR IN SOILS: ECOTOXICOLOGICAL EFFECTS ON PLANTS AND MICROARTHROPODS

Biochar is the solid residue produced by the pyrolysis bio-wastes (biomasses, sludges, agricultural wastes) for energetic purposes. Its application to soil is considered a promising tool to improve soil fertility and to mitigate climate change. Several benefits are been described using biochar in agriculture or in remediation. However high salinity, high alkalinity and the presence of contaminants (heavy metals and polycuclic aromatic hydrocarbons deriving from the originating feedstocks or enhanced by the production methods) might induce detrimental effects on soil habitat and soil biota. These potential risks can't be ignored and it is necessary ensure the safety of biochar before to add it to soils.