[1] Soil Hlth Inst, 2803 Slater Rd,Suite 115, Morrisville, NC 27560 USA
[2] North Dakota State Univ, Carrington Res Extens Ctr, 663 Highway 281 NE, Carrington, ND 58421 USA
[3] USDA ARS, Poultry Prod & Prod Safety Res Unit, O-303 Poultry Sci Ctr, Fayetteville, AR 72701 USA
[4] Int Maize & Wheat Improvement Ctr CIMMYT, Carretera Mexico Veracruz Km 45, Texcoco 56237, Mex, Mexico
[5] Washington State Univ, Dept Crop & Soil Sci, 2606 W Pioneer Ave, Puyallup, WA 98371 USA
[6] USDA ARS, Soil & Water Management Res Unit, 2300 Expt Stn Rd, Bushland, TX 79012 USA
[7] Inst Nacl Invest Forestales Agr & Pecuarias INIFA, Progreso 5, Coyoacan 04010, Cmx, Mexico
[8] Michigan State Univ, Dept Hort, 1066 Bogue St, E Lansing, MI 48824 USA
[9] South Dakota State Univ, West River Ag Ctr, 711N Creek Dr, Rapid City, SD 57703 USA
[10] Agr & Agri Food Canada, Edmonton, AB T5J 4C3, Canada
[11] Univ Alberta, Dept Agr Food & Nutr Sci, Edmonton, AB T6G 2P5, Canada
[12] Univ Missouri Extens Agr Engn, 201 Highway 136, East Rock Port, MO 64482 USA
[13] Univ Nebraska Lincoln, Panhandle Res & Extens Ctr, 4502 Ave 1, Scottsbluff, NE 69361 USA
[14] Ohio State Univ, Sch Environm & Nat Resources, 130 Williams Hall,1680 Madison Ave, Wooster, OH 44691 USA
[15] Univ Guelph, Dept Plant Agr, Guelph, ON N1G 2W1, Canada
[16] USDA ARS, Pasture Syst & Watershed Management Res Unit, Bldg 3702,Curtin Rd, University Pk, PA 16802 USA
[17] USDA ARS, Rangeland Resources & Syst Res Unit, 8408 Hildreth Rd, Cheyenne, WY 82009 USA
[18] USDA ARS, Coastal Plains Soil Water & Plant Res Ctr, 2611 W Lucas St, Florence, SC 29501 USA
[19] Penn State Univ, Dept Plant Sci, 408 Agr Sci & Ind Bldg, University Pk, PA 16802 USA
[20] Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2H1, Canada
[21] Agr & Agri Food Canada, Lethbridge Res & Dev Ctr, Lethbridge, AB T1J 4B1, Canada
[22] Univ Manitoba, Dept Plant Sci, 66 Dafoe Rd, Winnipeg, MB R3T 2N2, Canada
[23] Sustentabilidad Agr Queretaro SAQ, Calle Motolinia 17, Cimatario Santiago De Qu 76030, Que, Mexico
[24] Colorado State Univ, Dept Soil & Crop Sci, 307 Univ Ave, Ft Collins, CO 80523 USA
[25] USDA ARS, Grazinglands Res Lab, 7207 W Cheyenne St, El Reno, OK 73036 USA
[26] Texas A&M AgriLife Res, 3507 Hwy 59 E, Beeville, TX 78102 USA
[27] Louisiana State Univ, Sch Plant Environm & Soil Sci, 104 MB Sturgis Hall, Baton Rouge, LA 70803 USA
[28] Auburn Univ, Dept Crop Soil & Environm Sci, 202 Funchess Hall, Auburn, AL 36849 USA
[29] Washington State Univ, Dept Crop & Soil Sci, 16650 WA-536, Mt Vernon, WA 98273 USA
[30] Univ Kentucky, Dept Plant & Soil Sci, Res & Educ Ctr 1205,Hopkinsville St, Princeton, KY 42445 USA
[31] Michigan State Univ, WK Kellogg Biol Stn, 3700 E Gull Lake Dr, Hickory Corners, MI 49060 USA
[32] Univ Kiel, Inst Crop Sci & Plant Breeding, Christian Albrechts Pl 4, D-24118 Kiel, Germany
[33] Texas A&M AgriLife Res, Dept Soil & Crop Sci, MS 2474 Heep Ctr,370 Olsen Blvd, College Stn, TX 77843 USA
[34] Univ Minnesota, Southern Res & Outreach Ctr, 35838 120th St, Waseca, MN 56093 USA
[35] USDA ARS, Southwest Watershed Res Ctr, 2000 E Allen Rd, Tucson, AZ 85719 USA
[36] USDA ARS, Cropping Syst & Water Qual Res, Unit 243 Agr Engn Bldg, Columbia, MO 65211 USA
[37] South Dakota State Univ, Dept Agron Hort & Plant Sci, Room 248C NPB,Box 2140C,1110 Rotunda Ln, North Brookings, SD 57007 USA
[38] Cornell Univ, Dept Soil & Crop Sci, 306 Tower Rd, Ithaca, NY 14853 USA
[39] Texas A&M AgriLife Res, Dept Soil & Crop Sci, 1102 East FM 1294, Lubbock, TX 79403 USA
[40] Iowa State Univ, Dept Agron, 716 Farm House Ln, Ames, IA 50011 USA
[41] Ctr Bachillerato Tecnol Agr, 305 CBTA 305 Prolongac 9 Sur, Molcaxac 75650, Pue, Mexico
[42] Oregon State Univ, Columbia Basin Agr Res Ctr, 48037 Tubbs Ranch Rd, Adams, OR 97810 USA
[43] Agr & Agri Food Canada, Indian Head Res Farm, Indian Head, SK S0G 2K0, Canada
[44] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA
[45] Univ Calif Parlier, Davis Dept Plant Sci, 9240 S Riverbend Ave, Parlier, CA 93648 USA
[46] Oregon State Univ, Dept Crop & Soil Sci, 2750 Campus Way, Corvallis, OR 97331 USA
[47] Univ Missouri, Div Plant Sci, 64399 Greenley Pl, Novelty, MO 63460 USA
[48] Tennessee State Univ, Dept Agr & Environm Sci, Nashville, TN 37209 USA
[49] USDA ARS, North Cent Agr Res Lab, 2923 Medary Ave, Brookings, SD 57006 USA
[50] West Virginia Univ, Davis Coll Agr, Nat Resources & Design, 1194 Evansdale Dr, Morgantown, WV 26506 USA