Abstract
It was shown that in sand culture experiments beech and spruce seedlings have a high resistance to inhibitory effects of aluminium on growth and ion absorption up to a level of 10 μeq/ml in the nutrient solution. The resistance of beech appears to be somewhat higher. The variable parameters were form of nitrogen, of aluminium and their concentration. The data on growth dimension, root morphology and ion absorption were submitted to statistical analysis. Ammonium nitrogen nutrition has a beneficial effect on resistance to Al, although nitrate nitrogen favours root growth. Al chelates lead to better Ca and Mg translocation than Al sulphate. Under the present soil conditions found in the region of the Ardennes, there is no reason to believe that inhibitory effects of Al on beech and spruce root have developed.
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