Northwest and Allee Research and Demonstration Farm
Acidification from ammonium-nitrogen (N) fertilizers is inevitable in soil because nitrification (conversion of ammonium-N to nitrate-N) yields acidic hydrogen ions [H+ ]. Where N fertilizers are applied, soil fertility specialists recommend that soil sampling be undertaken every three to four years to determine (1) soil acidity, (2) if soils are acid, the amount of liming material needed to neutralize that acidity and restore soil pH to a desired level, and (3) the amount of plant nutrients available from a soil to recommend needed fertilizer. This experiment was undertaken to determine if a pelletal limestone (PLP) product, SuperCal 98, combined with urea fertilizer and banded in soil would prove beneficial to corn.
Iowa State University
Henning, Stanley and Doorenbos, Russell, "Corn Response to Urea-N and Pelletal Limestone in 1999" (2001). Iowa State Research Farm Progress Reports. 1767.