Iowans harvest and feed large amounts of hay each year. Between 1940 and 1950, an average of 3 1/2 million acres of hay were harvested in Iowa each year. The average annual yield of all hay harvested during this same period was nearly 5 1/2 million tons. What happens to this hay?
Shove, Gene C.; Barnes, Kenneth K.; and Beresford, Hobart
"A Self-Feeding Hay-Storage Structure,"
Iowa Farm Science: Vol. 8
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol8/iss12/5