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Hopkins Discusses content and cost of commercial fertilizers
Dr. Cyril G. Hopkins argues at the Rockford UHnols Farmers' Institute that most fertilizers supply only nitrogen phosphorus or potassium, and that soils in Illinois rarely need more than one or two. He warns against overreliance on commercial fertilizers, notes phosphorus shortages, and cites long term studies showing limited economic value for heavy fertilizer use.
MENTIONED IN THIS ARTICLE
Cyril G. Hopkins
Rockford
Uhnols Farmers’ Institute
Ilinois
Illnois
Rothamsted
England
Pennsylvania
Illinois
Tlinois Farmers’ Institute