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    Author(s): H. Clay Smith; Carter B. Gibbs
    Date: 1970
    Source: Research Note NE-122. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 4p.
    Publication Series: Research Note (RN)
    Station: Northeastern Research Station
    PDF: View PDF  (204.25 KB)

    Description

    Paired sugar maple trees with single tapholes were used to compare sap yields from vacuum-pumping with sap yields from gravity flow. Results indicated that vacuum yields were approximately twice as great as gravity flows. These results support previous findings from studies in which vacuum and gravity were compared with two tapholes on the same tree.

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    Citation

    Smith, H. Clay; Gibbs, Carter B. 1970. Comparison of vacuum and gravity sap flows from paired sugar maple trees. Research Note NE-122. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 4p.

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