Southeast Research and Demonstration Farm
The project goal is to compare yields of three different tillage systems on a sloping, moderately well-drained soil (Nira) and on a nearly level, poorly-drained soil (Kalona) in a continuous corn and a corn-soybean system. These plots began in 1990 and have been continued to present.
Brenneman, Greg and Rees, Myron
"Conservation Tillage Study,"
Farm Progress Reports: Vol. 2016
, Article 131.
Available at: http://lib.dr.iastate.edu/farmprogressreports/vol2016/iss1/131