Randy J. Dempsey1, Nathan A. Slaton2, Trenton L. Roberts1, Richard J. Norman3, Russell E. DeLong1, Matthew S. Fryer4 and Rasel Parvej5, (1)University of Arkansas, Fayetteville, AR, (2)Department of Crop, Soil, and Environmental Sciences, University of Arkansas System Division of Agriculture, Fayetteville, AR, (3)Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, (4)University of Arkansas, Little Rock, AR, (5)Virginia Tech Tidewater Agricultural Research & Extension Center, Suffolk, VA