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Promotion of flowering in Eucalyptus nitens by paclobutrazol was enhanced by nitrogen fertilizer


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Williams, DR, Potts, BM and Smethurst, PJ 2003 , 'Promotion of flowering in Eucalyptus nitens by paclobutrazol was enhanced by nitrogen fertilizer' , Canadian Journal of Forest Research, vol. 33, no. 1 , pp. 74-81 , doi: 10.1139/X02-157.

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We examined the effects of nitrogen and phosphorus fertilizer and paclobutrazol on flowering precocity and
abundance in Eucalyptus nitens Deane & Maid. Trials to test these effects consisted of a factorial nitrogen by phosphorus
experiment replicated on two sites and factorial nitrogen by paclobutrazol experiments conducted separately on reproductively
immature and reproductively mature trees. The increase in tree size due to nitrogen fertilization increased
the occurrence and abundance of precocious flower buds. However, the increase in tree size alone could not account
for the nitrogen effect on flowering, indicating a secondary mechanism of flower induction by nitrogen. The application
of both nitrogen fertilizer and paclobutrazol substantially increased the occurrence of precociously flowering trees over
that of either treatment applied alone. The efficacy of both paclobutrazol and nitrogen in stimulating the flowering of
the reproductively mature trees was affected by soil type, but this effect was overcome through the combination of nitrogen
and paclobutrazol. The combination of nitrogen and paclobutrazol also restricted tree growth and combined applications
on nitrogen deficient sites will be beneficial in commercial systems for producing eucalypt seed.

Item Type: Article
Authors/Creators:Williams, DR and Potts, BM and Smethurst, PJ
Journal or Publication Title: Canadian Journal of Forest Research
ISSN: 1208-6037
DOI / ID Number: 10.1139/X02-157
Additional Information:

BM Potts. Copyright 2003. National Research Council. Please refer to the journal link for access to the definitive, published version. Under the Canadian Copyright Act, individuals may download or print single copies of articles for personal research or study. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author.

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