1. Dept. Grain Science and Industry, Kansas State University, Manhattan KS 66506.
2. Dept. Agronomy, Kansas State University.
3. Corresponding author. USDA-ARS, Grain Marketing and Production Research Center and Kansas State University, Manhattan 66502. Phone: (785) 776-2376; Fax: (785) 776-2792; E-mail: george@usgmrl.ksu.edu