Abstract
Abstract Some maple producers are reluctant to take advantage of high-vacuum pumping to increase yields of sugar maple sap in their closed-tubing sap collection systems. They believe that only sap of significantly lower sugar content will be obtained. During 1985 and 1986, at Lake Placid, NY, sap collected from sugar maple trees subjected to three levels of vacuum pumping (10-, 15-, and 20-in. Hg) was compared to sap obtained by gravity flow. In most instances the higher levels of vacuum resulted in significantly higher sap volumes with no significant decrease in sap sugar content. Application of 15-in. Hg pumped vacuum at the taphole in a well-maintained tubing system should result in a significant increase in syrup production. North. J. Appl. For. 6:126-129, September 1989.
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