Abstract
Abstract Taxus media Rehd. ‘Anderson’ were grown at 4 boron rates: 0.5, 5.0, 25.0 and 50.0 ppm using 2 media:4 pinebark:l sand and 4 hardwood bark:l sand. toxicity symptoms developed when foliar concentration was between 85–100 μg/g of dry tissue. Foliar symptoms of toxicity were characterized by leaf-tip yellowing followed by leaf-tip necrosis and premature defoliation. Shoot and root growth were suppressed at the 50 ppm application rate. continued to accumulate in the foliage after the 2 higher rates of were discontinued. Foliar concentration of Ca, Mn, Fe and Zn were lower when plants were grown with 25 and 50 ppm when compared to plants grown with 0.5 and 5 ppm B.
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