Biochar Ecotechnology for Sustainable Agriculture and Environment summarizes current accomplishments in biochar ecotechnologies for enhancing agricultural production, encouraging sustainable waste management, and fostering a circular bioeconomy by advancing the pyrolysis process at both large-scale industrial and small-scale-local levels. Chapters in the book synthesize recent breakthroughs in biochar agro-ecotechnologies for increasing agricultural productivity and promoting circular bioeconomy by advancing the pyrolysis process and add mechanisms involved in biochar-fertilizer mediated in-soil biogeochemical cycle and nutrients retention, availability and their losses, soil-microbial responses, emission of greenhouse gases, and plant responses. Finally, this book aims to increase research understanding of nanotechnological breakthroughs in the production of biochar-based slow-release fertilizers, including their Nano characteristics involved in increasing fertilizer usage efficiency and managing chemical losses, for sustainable agriculture and the environment.