State Historical Society of Iowa

Corn Yield Map of Iowa, 1933

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Political map of Iowa showing all 99 counties divided up into regions. Each region is numbered and shaded according to the average corn yield from 1928-1932.
Courtesy of University of Iowa Library and Archives, "Yield of corn: average yield of corn in bushels per acre, by region 1928-1932: state average 37.57," Iowa State Planning Board, 1933

Description

Each year, the United States Department of Agriculture (USDA) publishes many statistics telling what happened in agriculture that year. One of those statistics is the average corn yield. They add together all of the bushels of corn harvested in that county and then divide by the number of acres of corn planted in the county to calculate an average for the county. The USDA publishes this information every year. For this publication, they show the average yield for a group of counties, called a region.

Transcript of the Corn Yield Map of Iowa

Source-Dependent Questions

  • What was the statewide average corn yield from 1928 to 1932?
  • What might be some of the reasons for the changes in yield between 1932 and 2018?

Citation Information 

"Yield of corn: average yield of corn in bushels per acre, by region 1928-1932: state average 37.57," Iowa State Planning Board, 1933. Courtesy of University of Iowa Library and Archives