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Abstract. Yields of sugar maple sap collected from three plastic pipeline systems by gravity, vacuum pump, and a vacuum pump with a transfer tank were compared during 2 years in northern Vermont.The transfer system yielded 27 percent more sap one year and 17 percent more the next year.Higher vacuum levels at the tapholes were observed in the transfer system.he transfer system yielded 27 percent more sap one year and 17 percent more the next year. Higher vacuum levels at the tapholes were observed in the transfer system.
How much sap does a tree give each season? Each tap yields an average of 10 gallons of sap per season: that yields about one quart of syrup. Larger trees have more than one tap so give more sap. What makes the sap flow? Warm sunny days (above 40 degrees F) and frosty nights are ideal for sap flow.