Cullars Rotation | |
 Cullars Rotation is the oldest continuous soil fertility experiment in the Southeastern United States. Cullars Rotation is located on the campus of Auburn University directly behind the Jule Collins Smith Museum of Fine Art. | |
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| Location | Woodfield Dr., E of US 29, Auburn, Alabama |
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| Coordinates | 32°35′19″N 85°29′1″W / 32.58861°N 85.48361°W |
| Built | 1911 |
| NRHP reference No. | 03000231[1] |
| Added to NRHP | April 18, 2003 |
The Cullars Rotation is a soil fertility experiment on the Auburn University campus in Auburn, Alabama and is listed on the National Register of Historic Places. The Cullars Rotation experiment, which started in 1911, is the oldest ongoing cotton fertility experiment in the United States, the oldest soil fertility experiment in the Southern United States, and the second oldest continuous cotton experiment in the world.