Diagnosis of zinc deficiency in seedlings of a tropical eucalypt (Eucalyptus urophylla S. T. Blake)
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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 μg Zn g−1 dry weight in plants with severe symptoms to 30–37 μg 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 μg 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.
Key words
Eucalyptus urophylla leaf analysis plant nutrition zincPreview
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References
- Boardman R and McGuire D O 1990 For. Ecol. and Manage. 37, 207–218.Google Scholar
- Dell B 1995 In Nutrition of the Eucalypts. Eds. PAttiwill and MAdams. CSIRO Publications, Melbourne (In press).Google Scholar
- Dell B 1995 Plant and Soil 167, 181–187.Google Scholar
- Dell B and Bywaters T 1989 Can. J. For. Res. 19, 427–431.Google Scholar
- Dell B and Malajczuk N 1994 Can. J. For. Res. 24, 2409–2416.Google Scholar
- Dell B and Robinson J M 1993 Plant and Soil 155/156, 255–261.Google Scholar
- Dell B and Wilson S A 1985 Plant and Soil 88, 377–384.Google Scholar
- Dell B and Wilson S A 1989 Plant and Soil 113, 287–290.Google Scholar
- Dell B et al. 1995 Nutrient Disorders in Plantation Eucalypts. Australian Centre for International Agricultural Research Monograph 31, Canberra.Google Scholar
- Malavolta E et al. 1962 In The Mineral Nutrition of Some Tropical Crops. pp 120–132. International Potash Institute, Berne.Google Scholar
- Smith F W 1986 In Plant Analysis-An Interpretation Manual. Eds. D J Reuter and J BRobinson. pp 1–12. Inkata Press, Melbourne.Google Scholar
- Ulrich A 1952 Annu. Rev. Plant Physiol. 3, 207–228.Google Scholar
- Ulrich A and Hills F J 1967 In Soil Testing and Plant Analysis. Part 2. Plant Analysis. Ed. G WHardy. pp 11–24. Soil Science Society of America, Madison.Google Scholar
- Wallace I M et al. 1986 Aust. J. Bot. 34, 41–51.Google Scholar