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Named after Professor George E. Morrow, the Morrow Plots date back to 1876 when they were created by Professor Manly Miles as an experimental field at the University of Illinois at Urbana-Champaign (UIUC). Morrow expanded the plots in 1879. This site is the earliest known experimental agricultural field in the United States and the second-oldest in the world (second only to Rothamsted Field, England, est. 1843). It also boasts the oldest known continuously-cultivated corn plot in the world. The Morrow Plots are located on the UIUC campus, where they are an integral part of the College of Agricultural, Consumer, and Environmental Sciences. The Morrow Plots became a National Historic Landmark in 1968.

View of the Morrow Plots.

View of the Morrow Plots.
The Morrow Plots were established by Professor Manly Miles as three 1/2-acre fields. Professor George E. Morrow later augmented the space to ten plots. The plots were used for experiments on crop rotation, soil quality, fertilization, and other practices relating to crop production. Experiments with using hybrid corn crops and commercial fertilizers, for example, resulted in eventually quadrupling the corn yield.

Though the site dates to 1876, the earliest available data on the plots comes from the 1888-1889 season. As the University expanded in the 20th century, the Morrow Plots shrank in size; land that once belonged to the plots is now occupied by the Observatory and Mumford Hall. Today, the Morrow Plots comprise three smaller plots, still used today and managed by the College of Agricultural, Consumer, and Environmental Sciences.
Image credit 1:

"Morrow Plots." ExploreCU. Accessed February 01, 2018. 

"The Morrow Plots: A Landmark for Agriculture." Department of Crop Sciences, University of Illinois. Accessed February 01, 2018. 

White, Wendy. "Morrow Plots, a University Tradition." ACES (College of Agricultural, Consumer, and Environmental Sciences). Accessed February 01, 2018.