1. USDA-ARS Wheat Quality Laboratory, Harris Hall, North Dakota State University, Fargo, ND 58105. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable.
2. Corresponding author. Phone: 701-231-8069. Fax: 701-239-1377. E-mail: douglas.doehlert@ndsu.edu
3. Department of Plant Sciences, North Dakota State University, Fargo, ND 58105.
4. Agronomy Department, Iowa State University, Ames, IA 50011-1010.