Northwest and Allee Research and Demonstration Farm
An experiment was established at the Northwest Research Farm (NWRF) in Sutherland to study the effects of aglime and ground eggshells on soil pH and crop yields. The research area was established in 2002. Treatments were applied in 2003.
Iowa State University
Kassel, Paul C., "Report on the Effects of Eggshells and Aglime on Soil pH and Crop Yields" (2009). Iowa State Research Farm Progress Reports. 594.