Iowa farmers have been taking an increased interest in sorghum the last few years. There were 177,000 acres of sweet sorghum in Iowa in 1940, four times as much as during the average year from 1929 to 1938.
Wilsie, C. P.; Dyas, E. S.; and Cannon, C. Y.
Farm Science Reporter: Vol. 2
, Article 6.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol2/iss2/6