We express our gratitude to the many people who contributed to this effort. Special thanks to the following:

Illinois State Water Survey-Champaign, Illinois
Kingsley Allan
Karla Andrew
James Angel
Kathleen Brown
Kris Chinosornvatana
Joyce Freese
Eva Kingston
Linda Hascall
Edward Krug
Kevin Merrifield
Michael Palecki
Devin Quarles
Ryan Schertz

NRES - Department of Natural Resources and Environmental Science – University of Illinois atUrbana-Champaign
Michael Bolin
Robert Darmody
Jeffrey Dawson
Kenneth Olson
Kenneth Robertson
James Schmidt
Robert Skirvin

Department of Crop Sciences – University of Illinois at Urbana-Champaign
Emily Heaton
Stephen Long
Matt Minnes
Emerson Nafziger
Wayne Pedersen
William Simmons

Department of Plant, Soil, and General Agriculture - Southern Illinois University - Carbondale
Imed Dami