Soils and Soil Fertility, 6th Edition

Frederick R. Troeh is Professor Emeritus, Agronomy, Iowa State University, Ames, who taught for 32 years. Dr. Troeh also worked for seven years as a soil scientist for the Soil Conservation Society in Idaho and California and served four years as a soil technologist for Cornell University in New York.

Louis M. Thompson is Emeritus Associate Dean of Agriculture and Emeritus Professor of Agronomy, also at Iowa State University. Dr. Thompson based the early editions of Solis and Soil Fertility on thirty years of teaching at Texas A&M and iowa State University. He continued teaching seminars and returned to teach introductory soil science while in the position of Associate Dean of Agriculture. Since retirement, he has published several articles related to the effects of climatic cycles on crop yields.