[1] Texas A&M Univ, REC, Dallas, TX 75252 USA
[2] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA
[3] Texas A&M Univ, REC, Overton, TX 75684 USA
[4] Texas A&M Univ, REC, Vernon, TX USA
[5] Texas A&M Univ, REC, Amarillo, TX 79106 USA
[6] Texas A&M Univ, REC, Beaumont, TX 77713 USA