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    Author(s): R. Kasten DumroeseDeborah S. Page-Dumroese; K. Francis Salifu; Douglass F. Jacobs
    Date: 2005
    Source: Canadian Journal of Forest Research. 35: 2961-2967.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (107.61 KB)

    Description

    We evaluated nutrient uptake efficiency and subsequent leaching fractions for western white pine (Pinus monticola Dougl. ex D. Don) seedlings grown with exponentially increasing or conventional (constant) fertilization in a greenhouse. Conventional fertilization was associated with higher leachate electrical conductivity and greater nutrient losses, which were more pronounced for the more mobile NO3-N than for NH4-N. Exponential fertilization increased seedling nitrogen (N) uptake efficiency (75%), which helped reduce leaching losses compared to conventional fertilization (50%). Although exponentially fertilized plants received 45% less fertilizer (20 mg N┬Ěplant-1) during the establishment and accelerated growth phases compared with conventional cohorts (36 mg N┬Ěplant-1), seedling morphological characteristics and nutrient status were similar at the end of greenhouse culture and after 2 years of growth in the field, except that exponential fertilization increased root volume after the first year and also increased ctomycorrhizal colonization. Reduction of applied fertilizer quantities and enhanced fertilizer uptake efficiency through exponential fertilization allows for production of high-quality seedlings while simultaneously minimizing fertilizer inputs and mitigating potential environmental contamination.

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    Citation

    Dumroese, R. Kasten; Page-Dumroese, Deborah S.; Salifu, K. Francis; Jacobs, Douglass F. 2005. Exponential fertilization of Pinus monticola seedlings: nutrient uptake efficiency, leaching fractions, and early outplanting performance. Canadian Journal of Forest Research. 35: 2961-2967.

    Keywords

    western white pine, Pinus monticola, seedlings

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