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  1. Two-year stem curvature and growth responses of three full-sibling families of loblolly pine to five root/stem form treatments

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    Author(s): Michael S. Murphy; Laurence R. Schimleck; Timothy B. Harrington; Richard F. Daniels
    Date: 2018
    Source: Tree Planters' Notes. 61(2): 55-64.
    Publication Series: Magazines or Trade Publications
    Station: Pacific Northwest Research Station
    PDF: View PDF  (2.0 MB)

    Description

    To examine the effects of taproot deformity on stem curvature, 90 full-sibling loblolly pine (Pinus taeda L.) seedlings (30 seedlings each from 3 families) were planted with 5 root/stem form treatments: straight taproot (control treatment), straight taproot with underground obstruction, taproot planted with J-root form, taproot planted at a 45-degree angle, and a straight taproot with the stem pulled to a 45-degree angle. Significant treatment differences (P ≤ 0.05) were found in year 1 for stem diameter and frequency of interwhorl oscillations, and all variables differed significantly among families. Although no significant treatment effects existed in year 2, family differences in diameter at breast height, height, and frequency remained significant. In addition, amplitude of stem curvature was significant for the treatment-by-family interaction in year 2. No differences were found for treatment, family, or their interaction for stem biomass. Results suggest that stem curvature responses of loblolly pine were more attributable to genetics than to root/stem form.

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    Citation

    Murphy, Michael S.; Schimleck, Laurence R.; Harrington, Timothy B.; Daniels, Richard F. 2018. Two-year stem curvature and growth responses of three full-sibling families of loblolly pine to five root/stem form treatments. Tree Planters' Notes. 61(2): 55-64.

    Keywords

    Sinuosity, taproot deformity, J-root planting.

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https://www.fs.usda.gov/treesearch/pubs/57848