Sixth Edition
Neal S. Eash
Professor of Biosystems Engineering & Soil Science
University of Tennessee in Knoxville,
Tennessee.
Thomas J. Sauer
Research Soil Scientist in the Soil,
Water, and Air Research Unit at the
USDA Agricultural Research Service
in Ames, IA, USA.
Deb O'Dell
Doctoral Candidate in the Biosystems
Engineering & Soil Science
Department at the University of Tennessee in Knoxville, TN, USA.
Evah Odoi
Adjunct Assistant Professor
in the Biosystems Engineering & Soil
Science at the University of Tennessee in Knoxville, TN, USA.
Illustrated by Mary C. Bratz