Donahue, Roy L.

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 dictionary"Frederick R. Troeh, PhD," is Professor Emeritus, Agronomy, Iowa State University. He ha...