Soils and Men, Yearbook of Agriculture 1938. Part 5: Soils of the United States

摘要

The report attempts to bring together and summarize, on a comparatively small scale, the data accumulated during the past half century on the enormous variety of soils in the United States. It describes the U.S. soil associations and the soils that compose them. The associations are arranged under the great soil groups. First there is a description of the region dominated by the great soil group, and then more detailed descriptions of each soil association within the region. These descriptions include the geographic setting, the climate, the native vegetation, the parent material from which the soils have developed, the characteristics of the soils themselves, and their general uses.