A three-year study (2013–2015) across Nebraska evaluated the impact of foliar-applied micronutrients on high-yield maize (Zea mays L.). Twenty-six on-farm strip trials assessed B, Mn, Fe, and Zn applications between V6 and V14 growth stages. Most soils and plants were above critical deficiency levels. Few significant grain yield increases were observed. Notable responses included a 0.4 Mg ha−1 increase from Fe application at Fe-deficient sites. Other micronutrient applications did not yield profitable benefits. The study concludes that foliar micronutrient application is beneficial primarily when visual deficiency symptoms are present.

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