Micronutrients
Micronutrients are needed in small amounts by corn, but deficiencies still may occur which could limit yields. The University of Arkansas Soil Testing Laboratory routinely tests soils for iron, manganese, zinc and copper. Molybdenum should not be deficient in corn under most circumstances in Arkansas. Iron, manganese, zinc, copper and boron are adequate in most soils. However, low levels and possible deficiencies of some of these could occur on leached, sandy soils of low CEC and on medium-textured soils that have an alkaline pH or that have been over-limed.