Randy J. Dempsey1, Nathan A. Slaton2, Trenton L. Roberts3, Richard J. Norman4, Russell E. DeLong1, Matthew S. Fryer5 and Rasel Parvej6, (1)University of Arkansas, Fayetteville, AR, (2)Department of Crop, Soil, and Environmental Sciences, University of Arkansas System Division of Agriculture, Fayetteville, AR, (3)University of Arkansas, Fayetteville, AR, US, (4)Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, (5)University of Arkansas, Little Rock, AR, (6)Virginia Tech Tidewater Agricultural Research & Extension Center, Suffolk, VA