Abstract
Ilex crenata `Helleri' (Helleri holly) can experience landscape establishment problems in the Southeast. Since aluminum toxicity is a major problem in acid soils of the Southeast, this experiment studied the effects of aluminum on Helleri holly grown in solution culture. A modified Hoagland's solution contained low phosphorus concentrations (32 μm), a 1:1 NH4+:NO3- nitrogen ratio, and aluminum treatments consisting of 0, 222, 444, 889, and 1332 μm Al supplied at equal ratios from AlCl3·6H2O and Al2(SO4)3·18H2O. The MINTEQA2 (version 3.11) chemical speciation model was used to predict activity of ions in solution. Shoot growth and root length were not affected by aluminum after 12 weeks in solution culture. Total plant nutrient uptake was monitored weekly. Preliminary results suggest that Helleri holly does not take up aluminum ions even though NH4+ is the preferred nitrogen source. Other studies have shown increased aluminum toxicity effects when NH4+ uptake exceeded NO3- uptake.
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