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Growth and Nutrition of Hybrid Poplar in Response to Phosphorus, Zinc, and Gibberellic Acid Treatments

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Phosphorus-induced growth inhibition in poplar hybrid shoots in a greenhouse trial was corrected by treatment with either soil-incorporated Zn fertilizer or leaf spray of gibberellic acid (GA). Increasing P applications depressed plant growth. Zinc added alone failed to stimulate growth, but when combined Zn with P it increased total biomass production by 27-41%. GA spray increased height and dry weight of shoot by 32% and 11%, respectively, at the expense of root growth without increasing total biomass. Foliar P and Zn concentrations were unchanged by GA treatment, but N concentrations were reduced, probably because of dilution. Although GA may be useful for stimulating shoot elongation, it may not be practical for correcting P-induced Zn disorders in hybrid poplar culture. FOR. SCI. 39(2):252-259.

Keywords: Deficiency; P-induced; interactions; shoot/root ratio

Document Type: Journal Article

Affiliations: Professor, Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, Ontario, M5S 3B3, Canada

Publication date: May 1, 1993

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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