Skip to main content

Late-Season Fertilization, Mineral Nutrient Reserves, and Retranslocation in Planted Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) Seedlings

Buy Article:

$21.50 plus tax (Refund Policy)

Bare-root Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were given three levels of nitrogen (N), phosphorus (P), and potassium (K) fertilization (low, medium, high) during July to October of their second growing season in a nursery. The following January seedlings were lifted, an initial sample was obtained, and the remaining seedlings were grown in a sand culture under three nutrient regimes: (1) no essential nutrients except Ca (0); (2) all essential nutrients except N (All - N); (3) all essential nutrients (All). After 8 weeks, seedlings were separated into new shoots, needles, stems, old roots, and new roots. Dry weight and nutrient content of these parts were determined and changes during growth calculated by subtracting initial sample values. In a second similar experiment seedlings were grown in an artificial soil in the greenhouse and harvested at 14-day intervals so that dry weight and nutrient content changes could be followed. Seedlings increased in dry weight by 49 percent over 8 weeks with no net uptake of N, P, or K. During this time some 40 percent of the N, 30 percent of the P, and 44 percent of the K in the seedlings was retranslocated to support new shoot and root growth. In the absence of external N, P, and K supply, needles, stems, and old roots all lost these nutrients. Needles appeared to be the most important N storage site since they continued to retranslocate N in the presence of an external supply and, similarly, old roots were the important P and K storage site and retranslocated P and K when these nutrients were supplied externally. Seedlings from high fertilizer treatment in the nursery had higher N concentrations and content than seedlings from the other two treatments. They also showed a higher relative growth rate (RGR) in sand culture, but not in artificial soil. Late-season fertilization increased the number of new roots produced after 14 and 28 days and hastened bud burst. These effects were attributed to increased mineral nutrient reserves. Forest Sci. 31:485-496.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: Root growth; bud flushing; relative growth rate

Document Type: Journal Article

Affiliations: Senior Tree Physiologist, Research Branch, Provincial Ministry of Forests, 1450 Government Street, Victoria, British Columbia, V8W 3E7, Canada

Publication date: 1985-06-01

More about this publication?
  • Important Notice: SAF's journals are now published through partnership with the Oxford University Press. Access to archived material will be available here on the Ingenta website until March 31, 2018. For new material, please access the journals via OUP's website. Note that access via Ingenta will be permanently discontinued after March 31, 2018. Members requiring support to access SAF's journals via OUP's site should contact SAF's membership department for assistance.

    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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more