John R. Weir,¹ Dirac Twidwell,² Carissa L. Wonkka<sup>2

1</sup>Authors are Research Associate, Natural Resource Ecology and Management, Oklahoma State University, 008C Ag Hall, Stillwater, OK 74078, USA (Weir, ); john.weir@okstate.edu
²Assistant Professor (Tidwell) and Postgraduate Research Associate (Wonkka), Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583, USA.