Northern Research and Demonstration Farm
The solubility of zinc (Zn) is less in soils with a pH above 7.5 than in soils with a lower pH. In Iowa there are several soil associations that contain high pH spots within fields where the surrounding soil pH is slightly acid. It is reasonable to expect that Zn availability, due to a difference in solubility, is different in the two areas. We now have the technology to differentially spread fertilizer within different areas of a field. The objectives of this study were to find grain yield responses to Zn fertilizers within fields, and define the soil characteristics in responsive areas.
Iowa State University
Dierickx Bickel, Anna and Killorn, Randy, "Corn Response to Zinc Fertilizer in Iowa" (2001). Iowa State Research Farm Progress Reports. 1801.