1. Dep. Plant Sci. and Landscape Architecture Univ. of Connecticut 1376 Storrs Rd Storrs CT 06269
2. International Plant Nutrition Institute P.O. Box 2539 West Lafayette IN 47996
3. Dep. of Plant Sci. Pennsylvania State Univ. 116 ASI Building University Park PA 16802
4. Dep. of Agronomy Purdue Univ. 915 W. State Street West Lafayette IN 47907
5. Dep. of Agronomy and Horticulture Univ. of Nebraska Lincoln, 377 K Plant Sci. Lincoln NE 68583
6. Dep. of Plant and Soil Sciences Univ. of Kentucky Ag Sci. North Lexington KY 40546
7. Dep. of Animal Sci. Cornell Univ. Morrison Hall Ithaca NY 14853
8. Iowa Soybean Association 1225 SW Prairie Trail Parkway Ankeny IA 50023
9. Dep. of Soil Sci. Univ. of Wisconsin 1525 Observatory Dr. Madison WI 53706
10. BARC‐EAST USDA‐ARS 10300 Baltimore Ave Beltsville MD 20705
11. Dep. of Crop and Soil Sciences Cornell Univ. Bradfield Hall Ithaca NY 14853
12. Crop Sciences Univ. of Illinois 1102 South Goodwin Ave. Urbana IL 61801
13. Crop and Soil Sciences North Carolina State Univ. Box 7619 Raleigh NC 27695
14. Dep. of Agronomy Iowa State Univ. 2104 Agronomy Hall Ames IA 50011
15. Plant Sciences Univ. of Missouri 109 Walters Hall Columbia MO 65211
16. NRCS, Connecticut 19 Harvey Dr. Old Saybrook CT 06475
17. Agricultural Analytical Services Laboratory Pennsylvania State Univ. Tower Rd. University Park PA 16802