Diagnosis of zinc deficiency in seedlings of a tropical eucalypt (Eucalyptus urophylla S. T. Blake) |
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Authors: | B. Dell Xu Daping |
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Affiliation: | (1) School of Biological Sciences, Murdoch University, 6150 Perth, Western Australia;(2) Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, P.R. China |
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Abstract: | A glasshouse experiment was undertaken to establish the internal Zn requirement for shoot growth of Eucalyptus urophylla, a fast-growing commercial plantation species widely planted in tropical regions of the world. A Zn-deficient sand was supplemented with ten rates of Zn and seedlings were harvested after three months. In Zn-deficient plants the new growth was dwarfed with small, necrotic leaves and short internodes. Foliar Zn concentrations declined markedly with leaf age in both Zn-deficient and Zn-adequate plants. The critical Zn concentration for the diagnosis of Zn deficiency also fell with leaf age. Zinc concentrations in the youngest fully expanded leaf ranged from 8–11 g Zn g–1 dry weight in plants with severe symptoms to 30–37 g Zn g–1 dry weight in non-deficient plants. The critical Zn concentration for the diagnosis of Zn deficiency at 90% of maximum shoot growth in the same leaf was 21 g Zn g–1 dry weight. This value is nearly twice that reported for several other species of eucalypts and may indicate a higher internal demand for Zn in tropical than in temperate eucalypts. |
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Keywords: | Eucalyptus urophylla leaf analysis plant nutrition zinc |
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