1. Soil Health Institute 2803 Slater Rd., Suite 115 Morrisville NC 27560 USA
2. North Dakota State Univ. Carrington Research Extension Center 663 Highway 281 NE Carrington ND 58421 USA
3. USDA‐ARS, Poultry Production and Product Safety Research Unit O‐303 Poultry Science Center Fayetteville AR 72701 USA
4. International Maize and Wheat Improvement Center (CIMMYT) Carretera México‐Veracruz km 45 Texcoco MEX 56237 México
5. Dep. of Crop and Soil Sciences Washington State Univ. 2606 W Pioneer Ave. Puyallup WA 98371 USA
6. USDA‐ARS, Soil and Water Management Research Unit 2300 Experiment Station Road Bushland TX 79012 USA
7. Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP) Progreso 5, Santa Catarina Coyoacán CMX 04010 México
8. Michigan State Univ. Dep. of Horticulture 1066 Bogue St. East Lansing MI 48824 USA
9. South Dakota State Univ. West River Ag Center 711N Creek Dr. Rapid City SD 57703 USA
10. Agriculture and Agri‐Food Canada Edmonton AB T5J 4C3 Canada
11. Dep. of Agriculture, Food and Nutritional Science Univ. of Alberta Edmonton AB T6G 2P5 Canada
12. Univ. of Missouri Extension Agricultural Engineering 201 Highway 136 East Rock Port MO 64482 USA
13. Univ. of Nebraska‐Lincoln Panhandle Research and Extension Center 4502 Avenue I Scottsbluff NE 69361 USA
14. The Ohio State Univ. School of Environment & Natural Resources 130 Williams Hall, 1680 Madison Ave. Wooster OH 44691 USA
15. Dep. of Plant Agriculture Univ. of Guelph Guelph ON N1G 2W1 Canada
16. USDA‐ARS, Pasture Systems & Watershed Management Research Unit Building 3702, Curtin Rd. University Park PA 16802 USA
17. USDA‐ARS, Rangeland Resources and Systems Research Unit 8408 Hildreth Rd. Cheyenne WY 82009 USA
18. USDA‐ARS, Coastal Plains Soil, Water, & Plant Research Center 2611 W Lucas St. Florence SC 29501 USA
19. Dep. of Plant Science Pennsylvania State Univ. 408 Agricultural Sciences and Industries Building University Park PA 16802 USA
20. Dep. of Renewable Resources Univ. of Alberta Edmonton AB T6G 2H1 Canada
21. Agriculture and Agri‐Food Canada Lethbridge Research and Development Centre Lethbridge AB T1J 4B1 Canada
22. Dep. of Plant Science Univ. of Manitoba 66 Dafoe Rd. Winnipeg MB R3T 2N2 Canada
23. Sustentabilidad Agropecuaria Querétaro – SAQ Calle Motolinia 17 Cimatario Santiago de Querétaro QUE 76030 México
24. Dep. of Soil and Crop Sciences Colorado State Univ. 307 University Avenue Fort Collins CO 80523 USA
25. USDA‐ARS, Grazinglands Research Lab 7207 W Cheyenne St. El Reno OK 73036 USA
26. Texas A&M AgriLife Research 3507 Hwy 59 E Beeville TX 78102 USA
27. Louisiana State Univ. School of Plant, Environment & Soil Sciences 104 M.B. Sturgis Hall Baton Rouge LA 70803 USA
28. Dep. of Crop, Soil and Environmental Sciences Auburn Univ. 202 Funchess Hall Auburn AL 36849 USA
29. Dep. of Crop and Soil Sciences Washington State Univ. 16650 WA‐536 Mount Vernon WA 98273 USA
30. Dep. of Plant and Soil Science Univ. of Kentucky Research and Education Center 1205, Hopkinsville St. Princeton KY 42445 USA
31. Michigan State Univ., W.K. Kellogg Biological Station 3700 E Gull Lake Dr. Hickory Corners MI 49060 USA
32. Kiel Univ. Institute of Crop Science and Plant Breeding Christian‐Albrechts‐Platz 4 Kiel 24118 Germany
33. Texas A&M, AgriLife Research Dep. of Soil and Crop Sciences, MS 2474, Heep Center 370 Olsen Blvd. College Station TX 77843 USA
34. Univ. of Minnesota, Southern Research and Outreach Center 35838 120th St. Waseca MN 56093 USA
35. USDA‐ARS, Southwest Watershed Research Center 2000 E Allen Rd. Tucson AZ 85719 USA
36. USDA‐ARS, Cropping Systems and Water Quality Research Unit 243 Agricultural Engineering Building Columbia MO 65211 USA
37. South Dakota State Univ., Dep. of Agronomy, Horticulture and Plant Science Room 248C NPB, BOX 2140C, 1110 Rotunda Ln. North Brookings SD 57007 USA
38. Dep. of Soil and Crop Sciences Cornell Univ. 306 Tower Rd. Ithaca NY 14853 USA
39. Texas A&M, AgriLife Research Dep. of Soil and Crop Sciences 1102 East FM 1294 Lubbock TX 79403 USA
40. Dep. of Agronomy Iowa State Univ. 716 Farm House Ln. Ames IA 50011 USA
41. Centro de Bachillerato Tecnológico Agropecuario No. 305 ‐ CBTA 305 Prolongación 9 Sur Molcaxac PUE 75650 México
42. Oregon State Univ., Columbia Basin Agricultural Research Center 48037 Tubbs Ranch Rd. Adams OR 97810 USA
43. Agriculture and Agri‐Food Canada, Indian Head Research Farm Indian Head SK S0G 2K0 Canada
44. Univ. of Arizona, School of Natural Resources & the Environment Tucson AZ 85721 USA
45. Davis Dep. of Plant Sciences Univ. of California 9240 S. Riverbend Ave. Parlier CA 93648 USA
46. Dep. of Crop and Soil Science Oregon State Univ. 2750 Campus Way Corvallis OR 97331 USA
47. Univ. of Missouri, Division of Plant Sciences 64399 Greenley Pl. Novelty MO 63460 USA
48. Tennessee State Univ., Dep. of Agricultural and Environmental Sciences Nashville TN 37209 USA
49. USDA‐ARS, North Central Agricultural Research Laboratory 2923 Medary Ave. Brookings SD 57006 USA
50. West Virginia Univ., Davis College of Agriculture, Natural Resources and Design 1194 Evansdale Dr. Morgantown WV 26506 USA
51. Dep. of Plant and Soil Science Univ. of Kentucky 405 Veterans Dr., Lexington KY 40546 USA
52. Univ. Politécnica de Francisco I. Madero (UPFIM), Ingeniería Agrotecnología Carretera Tepatepec‐San Juan Tepa, km 2 Tepatepec HID 42660 México
53. Utah State Univ., Plants, Soils and Climate Dep. 4820 Old Main Hill AGRS 328 Logan UT 84322 USA
54. Univ. of Missouri, Bradford Research Center College of Agriculture, Food, and Natural Resources 3600 E New Haven Rd. Columbia MO 65201 USA
55. Virginia Tech, Eastern Shore Agricultural Research and Extension Center 33446 Research Dr. Painter VA 23420 USA
56. Univ. of Kentucky, Dep. of Plant and Soil Sciences, UK Research and Education Center 1205 Hopkinsville St. Princeton KY 42445 USA
57. Kansas State Univ., Dep. of Agronomy, 2004 Throckmorton Plant Sciences Center 1712 Claflin Rd. Manhattan KS 66506 USA
58. Rodale Institute 611 Siegfriedale Rd. Kutztown PA 19530 USA
59. Southern Illinois Univ., Crops, Soils, and Environmental Management Program School of Agricultural Sciences 1205 Lincoln Dr. Carbondale IL 62901 USA
60. USDA‐ARS, Northern Plains Agricultural Research Laboratory 1500 North Central Ave. Sidney MT 59270 USA
61. Dep. of Agronomy Univ. of Wisconsin 1575 Linden Dr. Madison WI 53706 USA
62. Washington State Univ., Dryland Research Station, P.O. Box B Lind WA 99341 USA
63. Kansas State Univ., SW Research ‐ Extension Center 1474 State Highway 96 Tribune KS 67879 USA
64. Dep. of Land, Air, and Water Resources One Shields Avenue Univ. of California, Davis Davis CA 95616 USA
65. USDA‐ARS, Center for Agricultural Resources Research 2150 Center Ave., Building D, Suite 200 Fort Collins CO 80526 USA
66. Univ. of Delaware, Plant and Soil Sciences 531 South College Ave. Newark DE 19716 USA
67. Univ. of Florida, North Florida Research and Education Center 155 Research Rd. Quincy FL 32351 USA
68. Agriculture and Agri‐Food Canada, Swift Current Research and Development Centre 1 Airport Rd. Swift Current SK S9H 3X2 Canada
69. Univ. of Minnesota, Dep. of Soil, Water and Climate, SW Research & Outreach Center 23669 130th St. Lamberton MN 56152 USA
70. Univ. of Nebraska‐Lincoln, School of Natural Resources 807 South Hardin Hall, 3310 Holdrege St. Lincoln NE 68583 USA
71. Univ. of Tennessee, Dep. of Plant Sciences 2505 E J Chapman Dr. Knoxville TN 37996 USA
72. Washington State Univ., Dep. of Crop and Soil Sciences 245 Johnson Hall Pullman WA 99164 USA
73. Univ. of Guelph, School of Environmental Sciences ‐ Ridgetown Campus 120 Main St E Ridgetown ON N0P 2C0 Canada
74. Dep. of Soil and Crop Sciences Cornell Univ. 1001 Bradfield Hall Ithaca NY 14853 USA
75. Purdue Univ., Agronomy Dep. 915 W State St. West Lafayette IN 47907 USA
76. Agriculture and Agri‐Food Canada, Harrow Research and Development Center 2585 Essex County Rd. 20 Harrow ON N0R 1G0 Canada
77. USDA‐ARS, National Soil Dynamics Laboratory Auburn AL 36832 USA