Results of the Iowa Corn Yield Test are published to aid Iowa farmers in selecting corn hybrids. This is the seventy-second consecutive year for the test. Data from these tests are available in three different formats. These data are first released on Iowa State University's Cooperative Extension Services' computer communication network (EXNET) usually around Thanksgiving and are available at county extension offices. Anyone can subscribe to EXNET at a cost of $25 per year and receive the data as soon as they are released. All that is required is a computer, a modem, and the cost of a telephone call.
Iowa State University
Ziegler, K.E.; Vinson, W.H.; and Carroll, D.E., "The 1991 Iowa Corn Yield Test Report, District 4" (1991). Iowa Corn Yield Tests. 145.