Since 1920, the Iowa Agricultural Experiment Station has conducted an annual corn yield test in cooperation with the Iowa Crop Improvement Association. The purpose of the tests is to compare the performance of different corn varieties in various areas of the state and to make this information available for use by farmers in selecting the varieties they want to grow.
Iowa Farm Science Editorial Board
"Your Experiment Station Reports - Corn,"
Iowa Farm Science: Vol. 10
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss1/6