Northeast Research and Demonstration Farm
Grain producers in northeast Iowa are interested in the effects of liming rates on crops and soils. To achieve maximum alfalfa yields, rotations that include this crop must be limed to a minimum soil pH of 6.9. But, it is recommended that a rotation without alfalfa requires a soil pH of only 6.5. This experiment was designed to determine the effects of liming rate on soil pH for a corn-soybean rotation that is under, adequately, and over limed.
Iowa State University
Henning, Stanley J., "Crop and Soil Responses to Rates of Lime" (2009). Iowa State Research Farm Progress Reports. 557.