Abstract
`Nemaguard' peach [Prunus persica (L.) Batsch] seedlings were grown hydroponically in a modified Hoagland's solution containing NO3N:NH4-N ratios of 100:0, 75:25, 50:50, 25:75 and 0:100. The solutions contained 0 or 50 ppm aluminum supplied as Al(NO3)3·9H2O or AlNH4(SO4)2·12H2O. Analysis of pooled nitrogen source data revealed Al significantly reduced plant leaf area, height, total growth, and root:shoot ratio. Ammonium concentrations > 25% of supplied nitrogen significantly reduced leaf number, leaf area, height, lateral breaks, lateral growth, total growth, and leaf, stem, and root dry weights. Only height and dry weights (stem and root) for plants receiving 100% nitrate were significantly greater than plants receiving 25% of supplied nitrogen as NH4-N. Generally, phosphorus uptake significantly decreased in the presence of Al regardless of nitrogen source, but the greatest reductions occurred at high NH4-N concentrations.
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