Evaluation of Ground Eggshells as a Liming Material.
John Holmes, Iowa State Univ. Ext. Office, PO Box 433, Clarion, IA 50525-0433, Paul Kassel, Clay County Ext., 110 W Fourth Street Ste 100, Spencer, IA 51301, John Sawyer, Iowa State Univ, 2104 Agronomy Hall, Ames, IA 50011-1010, and D. A. Ruiz Diaz, Iowa State University, 3311 Agronomy Hall, Ames, IA 50011.
The usefulness of eggshells as a liming source was evaluated at two Iowa locations. Equal rates (ECCE) of agricultural lime and eggshells were applied to small plots. Yield responses and soil pH changes were measured for a four years period. Agricultural lime increased soil pH more quickly; however, change in soil pH was less in plots treated with agricultural lime than in plots treated with ground eggshells. Significant statistical differences were determined between the two liming materials and for the rate of lime applied.