ABSTRACT

The Cullars Rotation experiment (circa 1911) on the campus of Auburn University was placed on the National Register of Historical Places in April, 2003. It joins the nearby Old Rotation experiment (circa 1896) as one of only 4 field crop research sites in the U.S. to receive this honor. It is America’s oldest cotton fertility experiment, the oldest soil fertility study in the South, and the second oldest, continuous cotton study in the world (The Old Rotation is the oldest). The Cullar’s Rotation experiment continues to document long-term trends in non-irrigated crop yields and soil changes due to variable rates of P, K, S, micronutrients and lime. It provides a valuable and accessible teaching tool for monitoring crop nutrient deficiences. It also is a source of uniform soil with variable fertility conditions for allied studies. No other such resource exists in the Coastal Plain of the southern United States.