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...fertilizer has risen in 20 years from 1,500,000 tons to 6,200,000 tons. To handle the huge increase in crops, farmers have had to mechanize almost every farm job. From 1938 to 1958, farmers more than trebled their ownership of tractors, to 4,700,000 (an average1½ per commercial farm). Since 1945, they have increased their number of newer work-saving machinery by 1,200%-mostly with machines that had not even been invented in 1938. Farmers have invested $17.5 billion in 1,040,000 combines, 745,000 cornpickers, 590,000 pickup hay balers...