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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.
Throughout the 4-6 week sugar season, each tap hole will yield approximately ten gallons of sap. This is only a small portion of the tree's total sap production and will not hurt the tree. The average amount of syrup that can be made from this ten gallons of sap is about one quart.These amounts vary greatly from year to year, and depend upon the length of the season, the sweetness of the sap, and many complex conditions of nature, such as weather conditions, soil, tree genetics, and tree health.t takes about forty gallons of this slightly sweet sap, boiled down, to make one gallon of pure maple syrup. The sugarmaker concentrates his attention to the front of the evaporator where the boiling sap is turning a golden color as it approaches being maple syrup.