This book provides an in-depth exploration of biomass ashes and biochars as sustainable soil amendments. It is a comprehensive guide that details advanced production processes, environmental benefits, and practical applications, supported by detailed illustrations and tables. The book introduces innovative methods to transform agricultural and industrial waste into valuable resources for sustainable farming. It is essential for students, researchers, and professionals in environmental engineering and agriculture, serving as an invaluable resource for those dedicated to promoting green technologies and sustainable agriculture.