Describes the history of soil chemistry, its application in agriculture, chemical properties and composition of the principal types of soil, important chemical processes and chemical equilibrium in soils, fundamental laws of ion-exchange capacity of soils, and more.

This work contains results of the latest studies on the composition, structure and properties of humic substances, which are the largest and most important component of organic matter of different types of soils. It should be useful for soil scientists and nature conservationists.