Since check valve adaptors and spouts reduce sap backflow, this research studied whether or not dropline replacement is as important to improving sap yield when using these taps.
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This article explores the growth of the maple industry in the U.S. as reported in the 2012 Census of Agriculture.
Results from research into the impact of tap hole depth on sap yield.
Using smaller-diameter tubing can create a natural vacuum which can increase sap production. This article details some research into this method of sap collection, and offers tips on some practical applications.
The 2012 USDA Census of Agriculture reveals trends in growth for number of producers and number of taps in many states.