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a USDA-ARS, Vegetable and Forage Crop Research Unit, 24106 N. Bunn Road, Prosser, WA 99350
b Pioneer Hi-Bred International, 7250 NW 62nd Ave., Johnston, IA 50131
c Carrington Research Extension Center, North Dakota State Univ., Carrington, ND 58421
d Dep. of Plant Sciences, North Dakota State Univ., Fargo, ND 58105
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