Showing 191 – 200 of 378 resources

Examining the impact of seed production on sap sugar content

Sap flow is only part of what determines the total amount of syrup made (and how much money ends up in a syrup producer’s pocket). New research suggests sugar makers may be advised to look to their trees’ canopies as well as the weather forecast if they want to predict the tapping season.

Rethinking how we determine sap prices

A table to help determine sap prices, and commentary on the factors that should be considered when purchasing sap.

Choose wisely when selecting where to tap

Knowing when, where, and how to tap is critical to making good maple syrup and keeping trees healthy.

Evaluation of Sugar Maple Dieback Trends in the Upper Great Lakes Region

Crown dieback and declines in tree health of sugar maple (Acer saccharum) have been reported on various land ownerships in the western Upper Great Lakes region in recent years (MDNR 2009, 2010, 2012). In some areas, the crown dieback has affected high-value crop trees. Historically, sugar maple dieback (fig. 10.1) has been reported more frequently in the eastern part of its range and has not been described on the same scale in the Great Lakes region since the 1950s and 1960s (Bal and others 2015, Millers and others 1989). As a result, fewer studies of canopy health of sugar maple exist in the Midwest than in the Eastern United States.

Measuring Sap Flow

Keeping track of the amount of sap being collected is important for maintaining high yields and minimizing losses. This article explains how to measure sap using counters mounted on releasers.

The 3/16 phenomenon

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.

A Mathematical Model for Maple Sap Exudation

Sap exudation refers to the process whereby sugar maple trees (Acer saccharum) are capable of generating significant stem pressure in a leafless state, something that occurs to a lesser extent in only a few other related species such as birch and walnut. This exudation pressure is what causes maple sap to flow from a taphole in sufficient quantities to be harvested and processed into syrup. Exudation has been studied for well over 100 years and has been the subject of many scientific studies, but there is as yet no definitive explanation for how such large pressures can be generated in the absence of transpiration (i.e., when no photosynthesis occurs to drive the flow of sap).