Abstract
Abstract Soils low in Mg are common in the humid high rainfall areas of the world. Magnesium deficiency is frequently observed in corn (Zea mays L.) grown on the highly weathered soils of the Southeastern United States. This study reports on the effectiveness of Mg fertilizer to correct a Mg deficiency in young growing corn hybrids, to evaluate commercial corn hybrids for their Mg uptake efficiency as measured by ear leaf analysis, and to compare leaf Mg efficiency with yield efficiency. Paired rows of 28 hybrids on irrigated and nonirrigated plots were compared for their elemental ear leaf composition and yield following treatment of sidedress application of MgSO4.7H2O when corn was about 60 cm tall. Fertilizer Mg did not influence yield on either plots nor did it influence Mg and other cation concentrations in the ear leaf in the nonirrigated plots. The applied Mg fertilizer did influence the Mg concentration in the ear leaf and caused significant interactions with other cations in the hybrids on the ir...
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