[1] Kansas State Univ, Northwest Res Extens Ctr, 105 Expt Farm Rd,POB 505, Colby, KS 67701 USA
[2] USDA ARS, Coastal Plains Soil Water & Plant Res Ctr, Florence, SC USA
[3] Univ Florida, Ctr Landscape Conservat & Ecol, Inst Food & Agr Sci, Gainesville, FL USA
[4] USDA ARS, Conservat & Prod Res Lab, PO Drawer 10, Bushland, TX 79012 USA
[5] Robbins Associates Irrigat Mart, Ruston, LA USA
[6] Irrigat Assoc, Fairfax, VA USA