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From May till October 1999, 1-year-old birch seedlings were grown in a greenhouse in a substrate (forest soil under a birch tree + perlite, 1:1), without and with added aluminium chloride (40 and 160 mg Al dm⁻³). The added aluminium chloride inhibited the growth of seedlings, especially of their roots. At the end of the experiment the substrate treated with aluminium chloride contained more Al and...
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