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To determine the effect of aluminum (Al) on sugar maple (Acer saccharum Marsh.), seedlings were grown in sand irrigated with nutrient solution (pH 3.8) containing 0, 2.5, 5, 10, 20, or 40 mg L−1Al. Seedling growth was enhanced at 2.5 and 5 mg L−1Al. Although higher levels of Al reduced calcium (Ca) and magnesium (Mg) concentrations in leaves and caused root and foliar injury, no negative effects of Al on growth were observed.
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