Cullars Rotation 3800817 156545556 2007-09-08T20:03:21Z Lissoy 290675 link to Old Rotation 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. ==History== In the late 19th century, the land on which the Cullars Rotation sits was used in a number of agricultural experiments, including one that established the disease cotton rust was caused by a deficiency of [[potassium]]. In 1911, the [[Alabama Legislature]] set aside money for an experiment to study the long term effects of [[fertilizer|fertilization]] on a three-year rotation of [[cotton]], [[maize|corn]], and [[wheat]] and [[soybeans]]. The Cullars site was chosen for this study and the experiment has continued unabated since. In 1938, the site was purchased by the [[Auburn University|Alabama Polytechnic Institute]], which administered the study. In 2001, the portion of the Cullars site not occupied by the Cullars Rotation was landscaped as the grounds of the [[Jule Collins Smith Museum of Fine Art]], however a 40-foot buffer is maintained between the museum grounds and the rotation to ensure experimental integrity. ==Experiment== The Cullars Rotation consists of three sets of 14 soil treatments, with one set of treatments for each of the three crops (cotton, corn, and wheat and soybeans) in the rotation. Each treatment fills a roughly 2000 square foot (184 m²) plot, with a two foot (60 cm) buffer between plots. The 14 soil treatments are: # [[Legumes]] planted, but no [[nitrogen]] [[fertilizer]] # No legumes or nitrogen fertilizer # Nothing added to soil # Nitrogen fertilizer added, but no winter legumes # No [[phosphorus]] added # No micronutrients added # Excess [[potassium]] added # Rock phosphate added # No potassium added # Two-thirds of regular amount of potassium added # No [[lime (mineral)|lime]] added # No [[sulfur]] added # Complete fertilization with micronutrients # One-third of regular amount of potassium added Continuous farming of the plots which have not been given treatments have made certain sections of the Cullars Rotation some of the most nutrient poor soil in the United States. ==Miscellaneous== The Cullars Rotation is located east of the grounds of the Jule Collins Smith Museum of Fine Art at the corner of College Street and Woodfield Drive in Auburn. As an ongoing experiment, the Rotation is not open to the public, but can be viewed from the museum grounds. The Rotation was placed on the National Register of Historic Places on May 18, 2003. ==See also== *[[Old Rotation]] - A similar nearby agricultural rotation experimenta *[[List of Registered Historic Places in Lee County, Alabama]] ==References== *Auburn University Department of Agronomy and Soils (2004). ''[http://www.ag.auburn.edu/agrn/cullars.htm The Cullars Rotation (circa 1911)]''. Retrieved January 21, 2006. *Mitchell, C.C., Delaney, D.P., Balkcom, K.S. 2004. Alabama's "Cullars Rotation" Experiment (C. 1911) On National Register Of Historical Places [abstract]. American Society Of Agronomy Meetings. [[Category:Auburn, Alabama]] [[Category:Registered Historic Places in Alabama]]