The automobile and truck have also had a profound effect upon agriculture and farm life. Since their appearance on American farms between 1913 and 1920, trucks have changed patterns of production and marketing of farm products. Trucks deliver such items as fertilizer, feed, and fuels; go into the fields as part of the harvest equipment; and haul the crops to markets, warehouses, or packing and processing plants. Most livestock is trucked to market. The airplane may have been used agriculturally in the United States as early as 1918 to distribute poison dust over cotton fields that were afflicted with the ...(100 of 27369 words)