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Kernels of Knowledge: The A-Maizing Growth of Corn in Indiana
Indiana Ag Connection - 06/23/2022

Agriculture is a vital component of Indiana's history, culture and future. Discover the development of corn and Purdue University's contributions to its growth with Purdue Agriculture's short series, Kernels of Knowledge.

When Purdue University was founded in 1869, the average field corn yield in Indiana was 26 bushels per acre. Just over 150 years later, Indiana set the state record yield average at 195 bushels per acre in 2021 -- more than the national average!

"Corn is a predominant crop in Indiana due to the climate, landscape and productive soils. Corn can yield a much higher amount of grain per acre of land compared to most other U.S. crops and can be used for a large number of different products," explained Dan Quinn, assistant professor of agronomy and Purdue Extension corn specialist.

Corn, often referred to as maize, was a staple of the Native American diet and a ceremonial item. It was one of the "three sisters": corn, beans and squash. Corn stalks provided the trellis for intertwined beans, which added nitrogen to the soil. Squash spread along the ground, acting as living mulch.

From the mid-1800s until the late-1930s, farmers usually saved seed after harvest each fall, planted open-pollinated varieties, and pollinated their corn with the same variety to produce a crop of the same type -- or let insects, birds or wind pollinate their plants. High-quality seed was difficult to produce since both of these processes are difficult to control. The introduction and adoption of hybrids deliberately crossed for desirable traits improved stress tolerance and yield potential.

During the mid-1950s, continued improvements in corn hybrids, combined with rapid adoption of mechanization, synthetic fertilizer, and greater attention to farm and soil management practices resulted in higher yields. Today, farmers continue to increase corn yields every year using transgenic hybrids, where genetic material is introduced into corn plants using molecular technologies. They plant seed with traits such as resistance to insect pests and weed-killing herbicides, while adopting environmentally sustainable practices such as reduced or no tillage.

Indiana consistently ranks in the top 5 states for U.S. corn production, in part because technologies and practices developed by researchers at land-grant universities like Purdue helped fuel the increase in yield. Land-grant universities, established with a series of Congressional acts, are charged with education, research and outreach (called extension) to their local population.

Purdue Extension is crucial to the development of corn in Indiana, as Extension educators (or "agents," as they were called then) share research that helps farmers maximize crop production, and then relay their needs to Purdue researchers. Researchers, in turn, share crop management practices for farmers to test and implement, and the cycle begins again.

"Research innovations from Purdue have helped farmers become more knowledgeable, efficient and environmentally conscious crop managers, which are all aspects that have helped farmers get to where they are today," said Quinn.


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