Abstract
Leaf concentrations of N, P, K, Fe, and Mn in `Sterling' muscadine grapes (Vitis rotundifolia Michaux) grown for 2 years in sand culture were not influenced by different N fertilizer sources. Leaf Zn and Cu were higher in plants receiving N as NH4NO3 rather than as (NH4)2SO4. Growth was greatest in plants fertilized with NH4NO3 compared to those with either (NH4)2SO4 or NaNO3 fertilization. Leaf Ca, Mg, Mn, and Cu content decreased linearly and leaf N increased linearly as N fertilizer rates were raised from 1.8 to 16.1 mM. Plant growth was a positively correlated with leaf N but was negatively correlated with leaf Ca, Mg, and Mn content. Percent Mg in the leaves was reduced when N levels, regardless of N source, were raised from the low (1.8 mM) to middle (5.4 mM) rate. High leaf N levels were correlated with lower Ca and Mg in the leaves, indicating a possible relationship between N fertilization and the late-season Mg deficiency often observed in muscadine grapes.
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