Carl H. Bolster¹, Tibor Horvath², Brad D. Lee³, Stephanie mehlhope⁴, Stephen Higgins⁴ and Jorge A. Delgado⁵, (1)USDA-ARS, Bowling Green, KY, US, (2)USDA-NRCS, Greensboro, NC, US, (3)1100 Nicholasville Rd., University of Kentucky, Lexington, KY, (4)University of Kentucky, Lexington, KY, (5)USDA-ARS, Fort Collins, CO, US