Scarce prior research on micronutrients fertilization for corn and soybean has shown inconsistent yield responses in Iowa and the Corn Belt. Therefore, the objective of an experiment conducted during 2012 and 2013 was to evaluate the effect of boron (B), manganese (Mn), zinc (Zn), and their mixture on corn and soybean grain yield. Iowa State University has no interpretations of soil or tissue tests for micronutrients, other than for Zn in corn and sorghum.