1. USDA-ARS, Beltsville Agricultural Research Center, Instrumentation and Sensing Laboratory, Building 303, BARC-East, Beltsville, MD 20705-2350. 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: 301-504-8450. E-mail: delwiche@ba.ars.usda.gov
3. USDA-ARS, Department of Agronomy, University of Nebraska, Lincoln, NE.
4. University of Idaho, Plant Breeding and Genetics Department, Aberdeen Research and Extension Center, Aberdeen, ID.
5. USDA-ARS, Grain Marketing and Production Research Center, Manhattan, KS.