Natural Vacuum and the flow of maple sap
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Abstract
In 1967, Blum (1) reported that 43 percent more sap was
obtained from closed tubing installations on slopes than
from open or vented tubing. He associated this increase
with the natural vacuum created in the closed tubing.
Gains in sap yield from natural vacuum are especially
important, since the collection of sap is the most costly and
least profitable phase of making maple sirup. Moreover,
sap costs for a tubing network are mostly fixed costs; in-
creased sap flow from natural vacuum represents added
profit with little or no added cost. Recently, Laing et al. (6)
showed that sap produced with high vacuum differed little
in chemical composition from sap produced without
vacuum; both yielded sirup of comparable high quality.
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New York's Food and Life Sciences Bulletin
14
14
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1972-02
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New York State Agricultural Experiment Station
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natural vacuum; maple sap
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