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Soil amendment with biochar has become one of the phytotechnologies to reduce soil metal phyto-availability and its potential risks along the food chain. Biochar, derived from cocoa pod, was evaluated in soil Cd fractions (exchangeable, reducible, oxidizable, and residual) by modified Commission of the European Communities Bureau of Reference sequential extraction and its efficacy to ameliorate Cd toxicity to soil enzymes and leaf bioactive compounds. A pot experiment was conducted using Cd-spiked soil at 10\u2009mg\/kg with tomato (Solanum lycopersicum L.) at a biochar application rate of 1 and 3% (w\/w) for 6\u2009wk. The addition of biochar significantly reduced (p\u2009&amp;lt;\u20090.05) the exchangeable, reducible, and residual fractions by at least approximately 23%, with a consequential decrease in Cd root uptake and transport within tomato tissues. The activity of soil enzymes (catalase, dehydrogenase, alkaline phosphatase, and urease) was affected by Cd toxicity. However, with the exception of dehydrogenase, biochar application significantly enhanced the activity of these enzymes, especially at the 3% (w\/w) rate. As for the secondary metabolites we studied, Cd toxicity was observed for glutathione, terpenoids, and total phenols. However, the biochar application rate of 1% (w\/w) significantly ameliorated the effects of toxicity on the secondary metabolites. In conclusion, biochar demonstrated the potential to act as a soil amendment for Cd immobilization and thereby reduce the bioavailability of Cd in soil, mitigating food security risks. Environ Toxicol Chem 2021;40:3306\u20133316. \u00a9 2020 SETAC<\/jats:p>","DOI":"10.1002\/etc.4958","type":"journal-article","created":{"date-parts":[[2020,12,9]],"date-time":"2020-12-09T07:09:34Z","timestamp":1607497774000},"page":"3306-3316","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Short-Term Aging of Pod-Derived Biochar Reduces Soil Cadmium Mobility and Ameliorates Cadmium Toxicity to Soil Enzymes and Tomato"],"prefix":"10.1093","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6731-2231","authenticated-orcid":false,"given":"Clement Oluseye","family":"Ogunkunle","sequence":"first","affiliation":[{"name":"Environmental Botany Unit, Department of Plant Biology University of Ilorin Ilorin Nigeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fayoke Oluwaseun","family":"Falade","sequence":"additional","affiliation":[{"name":"Environmental Botany Unit, Department of Plant Biology University of Ilorin Ilorin Nigeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bosede Jumoke","family":"Oyedeji","sequence":"additional","affiliation":[{"name":"Environmental Botany Unit, Department of Plant Biology University of Ilorin Ilorin Nigeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Funmi Ojuolape","family":"Akande","sequence":"additional","affiliation":[{"name":"Institute of Ecology and Environmental Studies Obafemi Awolowo University, Ile-Ife Nigeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vinita","family":"Vishwakarma","sequence":"additional","affiliation":[{"name":"Centre for Nanoscience and Nanotechnology Sathyabama Institute of Science and Technology Chennai India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karthik","family":"Alagarsamy","sequence":"additional","affiliation":[{"name":"Centre for Nanoscience and Nanotechnology Sathyabama Institute of Science and Technology Chennai India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Ramachandran","sequence":"additional","affiliation":[{"name":"Centre for Nanoscience and Nanotechnology Sathyabama Institute of Science and Technology Chennai India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul Ojo","family":"Fatoba","sequence":"additional","affiliation":[{"name":"Environmental Botany Unit, Department of Plant Biology University of Ilorin Ilorin Nigeria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2020,12,8]]},"reference":[{"key":"2025010313373513400_etc4958-bib-0001","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1016\/S0076-6879(84)05016-3","article-title":"Catalase in vitro","volume":"105","author":"Aebi","year":"1984","journal-title":"Methods Enzymol"},{"key":"2025010313373513400_etc4958-bib-0002","doi-asserted-by":"crossref","first-page":"31","DOI":"10.3184\/095422914X13884321932037","article-title":"Fractionation and mobility of cadmium and lead in soils of Amol area in Iran, using the modified BCR sequential extraction method","volume":"26","author":"Ahmadipour","year":"2014","journal-title":"Chem Spec Bioavailab"},{"key":"2025010313373513400_etc4958-bib-0003","doi-asserted-by":"crossref","first-page":"100325","DOI":"10.1016\/j.eti.2019.100325","article-title":"Phytotoxicity of nano-zinc oxide to tomato plant (Solanum lycopersicum L.): Zn uptake, stress enzymes response and influence on on-enzymatic antioxidants in fruits","volume":"14","author":"Akanbi-Gada","year":"2019","journal-title":"Environ Technol Innov"},{"key":"2025010313373513400_etc4958-bib-0004","first-page":"311","volume-title":"Methods in Applied Soil Microbiology and Biochemistry","author":"Alef","year":"1995"},{"key":"2025010313373513400_etc4958-bib-0005","article-title":"DI762-84. 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