Association of American Plant Food Control Officials, University of Kentucky, 103 Regulatory Services Bldg., Division of Regulatory Services, Lexington, KY 40546-0275, (859) 257-2668, Fax (859) 257-9478. www.aapfco.org. David Terry, secretary.

The Fertilizer Institute, 820 First St. NE Suite 430, Washington, D.C. 20002, (202) 962-0577, Fax (202) 962-0577, information@ftf.org, www.tfi.org. Gary D. Myers, president.

Potash & Phosphate Institute, 655 Engineering Dr., Suite 110, Norcross, GA 30092-2837, (770) 447-0335, Fax (770) 448-0439, ppi@ppi-ppic.org, www.ppi-ppic.org. David Dibb, president.