- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
This chemical sprayer douses soybean plants with insecticides to help crop growth. The use of chemicals as insecticides and fertilizers greatly changed the way farming was done. With these discoveries, farmers could supplement nutrients that crops were lacking. How we learn about communities; Communities and Geography; American Communities in History. 15 Economics; 16 History; 18 Social systems.
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