Results of the Iowa Com Yield Test are published to aid Iowa farmers in selecting corn hybrids. This is the seventieth consecutive year for the test. The presentation of data for the hybrids tested does not imply approval or endorsement by the authors or by the agencies sponsoring or conducting the test. Entries in tables I and 2 are designated by brand name and variety.
Iowa State University
Ziegler, K.E., "The 1989 Iowa Corn Yield Test Report, District 1" (1989). Iowa Corn Yield Tests. 134.