By Andi Anderson
A remarkable soil sample collected in 1861 is helping researchers better understand how agricultural practices and land use have changed over more than a century.
Preserved at the University of Illinois Urbana-Champaign, the sample offers a rare opportunity to compare historical soil conditions with those found in the same area today.
The soil was originally collected from native prairie land near present-day Tamaroa, Illinois. Over the past 165 years, the area has been transformed into productive farmland, making it an ideal location for studying the long-term effects of agricultural development on soil health.
The historic sample is part of a collection containing more than 8,000 soil samples that were rediscovered by Andrew Margenot, Professor in the Department of Crop Sciences at the University of Illinois Urbana-Champaign. The collection includes samples gathered from hundreds of locations throughout Illinois, many of them collected before modern farming practices became widespread.
Researchers are revisiting more than 460 original sampling locations to compare past and present soil conditions. Their goal is to better understand changes in soil fertility, nutrient levels, erosion, and other characteristics that influence agricultural productivity and environmental quality.
To continue the investigation, researchers returned to Perry County, where the original sample was collected. With the assistance of retired soil scientist Sam Indorante and Mindy Siner, Soil Scientist with the U.S. Department of Agriculture Natural Resources Conservation Service, the team identified a representative location using historical records, maps, and land descriptions.
The research expanded beyond the original top six inches of soil by examining the entire soil profile several feet below the surface. This approach allows scientists to study different soil layers and gain a clearer understanding of how the soil developed over time.
"We know that it was 1861 when it was originally sampled, so we come back and we're like opening up the time capsule and looking at the soil, the different soil properties, the different soil layers, to see the changes that have occurred," Indorante said.
Researchers observed distinct soil layers, including darker surface horizons, lighter subsoil layers, and dense clay deposits common in southern Illinois. Evidence of soil compaction linked to past agricultural activities was also identified.
According to Kevin McSweeney, Clinical Professor in the Department of Natural Resources and Environmental Sciences, soil layers provide valuable clues about the past.
"Each one of those is like a chapter in a book, telling you the history," said McSweeney, clinical professor in the Department of Natural Resources and Environmental Sciences.
The project is expected to improve understanding of how farming practices have influenced soil resources over generations. Findings may help guide future conservation efforts, nutrient management strategies, and soil fertility recommendations.
For researchers, the study is more than a scientific investigation. It is also an opportunity to connect historical records with modern agriculture and continue decades of work dedicated to soil conservation and sustainable land management.
"We've dedicated our lives, our professional lives, to soil, soil conservation, good land use, water quality, air quality, and the parts the soil plays," he said. "But it makes me very proud that we're moving it forward still."
As scientists continue analyzing the samples, the historic soil collection is providing valuable insights into the past while helping shape the future of Illinois agriculture and environmental stewardship.
Photo Credit: gettyimages-sasiistock
Categories: Illinois, Sustainable Agriculture