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)Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, US, (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