Preface.
Figure Credits.
Abbrreviations Used in This Book.
Dictionary of Agricultural and Environmental Science Terms.
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.
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