The Iowa corn yield test is conducted by the Iowa Crop Improvement Association in cooperation with the Iowa Agricultural Experiment Station. This controlled test began in 1920. Personnel of these organizations do all planting and harvesting and compute performance data. This test is not a contest and should not be confused with the 5-acre Iowa Master Corn Growers Contest.
Robinson, Joe L. and Hutchcroft, Charles D.
"The 1953 Iowa corn yield test,"
Bulletin P: Vol. 6
, Article 1.
Available at: http://lib.dr.iastate.edu/bulletinp/vol6/iss116/1