Abstract
Abstract A pot experiment with soils from Austria (Mollisol and Alfisol) and Brazil (two Oxisols), quite different in pH values and organic carbon contents, was carried out. Several soil tests for aluminum (Al) were evaluated and compared for their ability in predicting plant growth reductions and plant Al concentrations. Concerning the efficacy of the extradants in solubilizing soil Al, the amount of Al extracted decreased in the following order: 0.03M LaCl3> 1M KCl > 1M NH4Cl > 0.01 M CaCl2. Only AlCaCl2 and Al saturation correlated significantly with shoot yield of Poa pratensis (r = 0.76*** for CaCl2; r = 0.84 *** for Al saturation) and Phaseolus vulgaris (r = 0.65** for CaCl2; r = 0.83** for Al saturation). The results indicated that soil organic matter and the nutrient status of the soil had an important effect as diminishing Al uptake and improving growth of both Poa pratensis and Phaseolus vulgaris. Interactions between Al and magnesium (Mg) were also observed.
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