Abstract
Aluminum toxicity resulted in abnormal root development with many short thick roots and was found at pH 4.3 with or without added Al. The toxicity of Mn was found with no added Mn, and with 50 and 100 ppm added Mn at pH values ranging from 4.0 to 4.7 and appeared as dark spots on the leaves. At pH values ranging from 5.8 to 6.0, no toxicity symptoms were recorded in the absence of added Mn. Al was more detrimental to seedling development than was Mn.
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