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    Author(s): Russell S. Walters; H. Clay Smith
    Date: 1975
    Source: Research Note NE-213. 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  (403.42 KB)

    Description

    Maple sap yields collected by using plastic tubing with a vacuum pump increased as the vacuum level was increased. Sap volumes collected at the 10- and 15-inch mercury vacuum levels were statistically significantly higher than volumes collected at the 5-inch level. Although the 15-inch vacuum yielded more sap than the 10-inch vacuum, the difference was not statistically significant. An efficient vacuum system should have a vacuum level of at least 10 inches of mercury at the taphole.

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    Citation

    Walters, Russell S.; Smith, H. Clay. 1975. Sugar maple sap volume increases as vacuum level is increased. Research Note NE-213. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 4p.

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