1. USDA-ARS; Forage and Range Research Lab.; Logan UT 84322-6300
2. Joint contribution of the USDA-ARS and the Utah Agric. Exp. Stn. Utah Agric. Exp. Stn. Journal Paper no. 7931. Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the USDA or Utah State Univ