1. Graduate research assistant and associate professor, respectively, Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506-2201.
2. Corresponding author. Phone: 785-532-4082. Fax: 785-532-4017. E-mail: tjh@wheat.ksu.edu
3. Associate professor, Department of Statistics, Kansas State University, Manhattan, KS 66506-2201.