Hilgard, professor of agriculture at the University of California, sets out how soils form from rock by physical and chemical processes, which minerals and rocks make which soils, and how soils hold water, air and plant food. His distinctive contribution is the contrast between soils of humid and arid regions, drawn from decades of work in Mississippi and California.
A founding work of soil science, of interest to historians of agriculture and the American West. Download the free EPUB.