Bulletin P


The results of the Iowa Corn Yield Test are published to aid Iowa farmers in selecting corn varieties adapted to their farms. This is the forty-eighth consecutive year for the Iowa Corn Yield Test since it began in 1920. A picker-sheller has been used to harvest a majority of fields since 1960 and on all fields since 1965.

Individual-year yield data are presented for corn varieties entered two or more consecutive years in a district. One-, 2- and 3-year yield averages are presented in tables 1 through 6 for both high and moderate plant populations for each district. Information concerning other attributes of the entries tested also are listed in tables 1 through 6. This is the fifth year of the district arrangement shown in fig. 1 and the fifth year in which all entries are compared at both high and moderate plant populations at each location.

The presentation of data for the varieties tested does not imply approval or endorsement by the authors or by the agencies sponsoring or conducting the test. The entry names listed in the tables are their brand and variety designations.



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