This text provides an accurate and comprehensive dictionary of terms used in the agricultural and environmental sciences, it includes many biological, chemical, and health terms that are important for a full understanding of the subject fields. Presenting thousands of entries, many not found in similar dictionaries, this new reference contains the latest, most up to date definitions and designations of usage in the fields of agriculture, soil science, animal science, agricultural engineering and many more.

Frederick R. Troeh, PhD, is Professor Emeritus, Agronomy, Iowa State University, Ames, where he taught for over 30 years. Dr. Troeh has numerous years of experience in the field of soil science with an emphasis on soil conservation and has worked abroad in Uruguay, Argentina, and Morocco. The late Roy L. Donahue, PhD, was Professor in the field of soil science at Michigan State University, East Lansing, as well as educator in India and Africa. He assembled much of the background material for this dictionaryFrederick R. Troeh, PhD, is Professor Emeritus, Agronomy, Iowa State University. He has taught for over 32 years at Iowa State University and has numerous years of experience in the field of soil science.

Roy L. Donahue, PhD, was a great teacher and instigator of textbooks and other writing projects (he sadly died in 1999). He assembled most of the background material for this dictionary over a period of approximately ten years.