1. a Department of Agronomy, 2004 Throckmorton Plant Sciences Center , Kansas State University , Manhattan, KS, 66506 Phone: Fax: E-mail:
2. b Department of Crop, Soil, and Environmental Sciences, Plant Science 115 , University of Arkansas , Fayetteville, AR, 72701 Phone: Fax: E-mail:
3. c Department of Chemical Engineering, Bell 3202 , University of Arkansas , Fayetteville, AR, 72701 Phone: Fax: E-mail:
4. d USACE Engineer Research and Development Center 72 Lyme Road , Cold Regions Research and Engineering Laboratory , Hanover, NH, 03755, USA Phone: Fax: E-mail: