Nutrient levels vary not only by variety but also according to the maturity of the crop and storage time. Nutritive content can be used to market specialty potatoes. In addition to the U.S. Department of Agriculture, State universities and county Cooperative Extension personnel can provide useful information on local production methods and marketing practices. Many potato production educational programs are sponsored by the Cooperative Extension System. In Washington, the Washington State Potato Conference and Trade Fair is held each year.
Similar programs exist in Idaho, Maine, Michigan, Nebraska, and Oregon.
Potatoes are included in numerous other conferences. Agricultural Communications Center. 111 Ag Sciences Building, University of Idaho. Moscow, ID 83843. Potato Growers Handbook.