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GROWTH AND WOOD DENSITY RESPONSES TO LATER-AGE FERTILIZER APPLICATION IN PINUS RADIATA

GROWTH AND WOOD DENSITY RESPONSES TO LATER-AGE FERTILIZER APPLICATION IN PINUS RADIATA Growth or ring width responses to nitrogen, phosphorus and the two combined fertilizers were significant over five out of seven years that followed treatment (post-treatment period) in thinned, mid-rotation radiata pine (Pinus radiata D. Don). Responses were similar between nitrogen and phosphorus treatments and largest in the nitrogen plus phosphorus (NP) treatment. Fertilizer increased the proportion of wood formed in mid-rotation relative to juvenile wood thereby increasing tree density in comparison to the control. Fertilizers, other than nitrogen, significantly lowered density compared to the control in the posttreatment period only. Density was higher in nitrogen than phosphorus and similar between phosphorus and NP. Density responses lasted for up to 5 years and were inconsistent between treatments. Ring width and density were weakly correlated. Ring width and density responded differently to climatic variables within and between sites, signalling independent physiological controls and highlighting the importance of site specific differences. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png IAWA Journal Brill

GROWTH AND WOOD DENSITY RESPONSES TO LATER-AGE FERTILIZER APPLICATION IN PINUS RADIATA

Nyakuengama, John Gwinyai; Downes, Geoffrey M.; Ng, Jane
IAWA Journal , Volume 23 (4): 18 – Jan 1, 2002
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References (85)

Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0928-1541
eISSN
2294-1932
DOI
10.1163/22941932-90000313
Publisher site
See Article on Publisher Site

Abstract

Growth or ring width responses to nitrogen, phosphorus and the two combined fertilizers were significant over five out of seven years that followed treatment (post-treatment period) in thinned, mid-rotation radiata pine (Pinus radiata D. Don). Responses were similar between nitrogen and phosphorus treatments and largest in the nitrogen plus phosphorus (NP) treatment. Fertilizer increased the proportion of wood formed in mid-rotation relative to juvenile wood thereby increasing tree density in comparison to the control. Fertilizers, other than nitrogen, significantly lowered density compared to the control in the posttreatment period only. Density was higher in nitrogen than phosphorus and similar between phosphorus and NP. Density responses lasted for up to 5 years and were inconsistent between treatments. Ring width and density were weakly correlated. Ring width and density responded differently to climatic variables within and between sites, signalling independent physiological controls and highlighting the importance of site specific differences.

Journal

IAWA Journal – Brill

Published: Jan 1, 2002

Keywords: Pinus radiata ; N and P fertilizers; growth response; wood quality; fibre properties; REsidual Maximum Likelihood; Path analysis; Australia.

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