The discipline of soil chemistry examines the chemical and mineralogical characteristics of the soil environment and the chemical processes that distribute matter between the soil solid, solution, and gaseous phases. This book provides a comprehensive treatment of the composition and chemical properties of soils and the processes that govern their fate in the environment. It covers a variety of topics including soil chemical environment, soil minerals, soil organic matter, cation exchange, oxidation-reduction, mineral weathering and solubility, surface chemistry and adsorption reaction, and acidity and salinity in soil materials. The book has been thoroughly revised and all chapters have been updated.