This revised edition emphasizes two aspects of soils: the science of soils (chemical make-up, biological properties, their place in the ecosystem) and the management of soils. Plaster provides the latest information on soil ecology, soil/water conservation and soil evaluation. Approximately 600 end of chapter review questions, problems and activities are also included for practice in applying basic soil science principles. This book should be of interest to undergraduates on courses in soil science.