Effect of Foliar Micronutrients (B, Mn, Fe, Zn) on Maize Grain Yield, Micronutrient Recovery, Uptake and Partitioning

Abstract/Summary

This study evaluated the effect of foliar-applied micronutrients (B, Mn, Fe, Zn, and Fe/Zn combinations) on maize grain yield, micronutrient recovery, uptake, and partitioning. Five experiments were conducted in Nebraska in 2014 and 2015. Treatments were applied at different growth stages and rates. Most foliar applications had no effect on grain yield, except for some Mn and Fe applications. A 19% yield increase was observed with Mn applied at the V18 stage, while Fe application increased yields by 13.5–14.6% across sites with visible Fe deficiency. Zn application occasionally reduced yield due to toxicity. Foliar-applied B, Mn, and Zn had limited translocation, though early B applications were mobile to reproductive tissues. Results highlight the importance of confirming micronutrient deficiencies before foliar application and targeting specific growth stages for optimal uptake.

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