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Size and Physiological Grades of Some Hardwood Seedlings Produced Under Different Nursery Spacings in Nigeria

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Abstract:

One-year-old teak (Tectona grandis L. f.) seedlings (n = 1450) grown under four spacings--30 cm², 25 cm², 22.5 cm X 15 cm, and 15 cm X 7.5 cm--were classified as dead or <1 cm, 1-2 cm, 2-3 cm, and 3-4 cm collar diameter sizes. Percentage of dead and <1 cm seedlings increased and those of 1-2 and 2-3 cm seedlings decreased with increasing density of sowing. Highest percentage of <1 cm seedlings was obtained under 22.5 cm X 15 cm spacing and under 30 cm² for both 1-2 cm and 2-3 cm seedlings. Opepe (Nauclea diderrichii [D. Wild] Merrill), idigbo (Terminalia ivorensis A. Chev.), Khaya ivorensis A. Chev., and gedunohor (Entandrophragma angolense Welw.) seedlings grown under 30 cm² in a commercial nursery showed similar trends. The root regenerating potential of stumps, planting stock prepared by cutting the teak seedlings back to 5 cm- shoot and 12.5 cm-taproot, varied with size of the stump. The <1 cm stumps resumed growth through root formation while both 1-2 and 2-3 cm stumps started with shoot formation. Both sprouting and root formation started first with the <1 cm stumps. Number and total length of roots, leaf area, and dry weight of both root and shoot developed on the cut-back seedlings increased with time after planting but decreased with increasing size of the planting stock. These results indicate that the <1 cm followed by 1-2 cm diameter seedlings will produce the best stumps to plant for fast establishment and that their maximum production will be under a 22.5 cm X 15 cm spacing for a 1-year duration. Forest Sci. 22:301-306.

Keywords: Teak; collar diameter; root regenerating potential; stump

Document Type: Journal Article

Affiliations: Department of Forest Resources Management, University of Ibadan, Nigeria

Publication date: September 1, 1976

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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