Iron, manganese, zinc, copper, and boron are also adequate in most soils. However, low levels and possible deficiencies of some of these could occur on leached, sandy, low CEC soils and on medium textured soils that have a pH above 7.0. Zinc is the micronutrient most likely to be found deficient in corn. Analysis of plant tissue during the growing season is the best way to assess micronutrient status. The University of Arkansas Diagnostic Service Laboratory at Fayetteville will analyze plant tissue for a fee.
Zinc sulfate is a preferred source since it dissolves fairly easily and also supplies sulfur.
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