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The Influence of Nitrogen Supply on the Growth Form of Pinus radiata Seedlings

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Pinus radiata seedlings were raised from seed and grown in perlite culture at five levels of N (urea) supply: 100, 20, 5, 0.5 ppm, and no N. Increasing the N supply above 0.5 ppm N both increased the growth rate and changed the distribution of dry matter within the seedlings. With increasing levels of N there were: (1) greater stem basal diameters in proportion to heights; (2) greater numbers of branches; (3) greater weights of branches in proportion to stem weights; (4) greater weights of shoots in proportion to root weights. The concentrations of N in the shoots and roots of seedlings in the 20 ppm N, 5 ppm N, and 0.5 ppm N treatments were very similar. Forest Sci. 23:64-68.

Keywords: Branch weight; growth rate; perlite culture; root weight; stem weight; urea

Document Type: Journal Article

Affiliations: Soil Scientist, Forest Research Institute, Private Bag, Rotorua, New Zealand

Publication date: March 1, 1977

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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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