Links and organizations providing more information on fertilizers.
Wisconsin Crop Production Association
1001 Arboretum Drive, Suite 102
Waunakee, WI 53597
Robert Poehnelt, Executive Director
Wisconsin Aglime Association
PO Box 286
Plain, WI 53577-0256
Steve Hanvold, President
Association of American Plant Food Control Officials
The AAPFCO is an organization of fertilizer control officials from each state in the United States, from Canada and from Puerto Rico who are actively engaged in the administration of fertilizer laws and regulations; and, research workers employed by these governments who are engaged in any investigation concerning mixed fertilizers, fertilizer materials, their effect, and/or their component parts.
The Fertilizer Institute
Represents the makers, transporters and providers of fertilizer.