A Statistical Evaluation of Some of the Factors Responsible for the Flow of Sap from the Sugar Maple.

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Abstract
A significant portion of the daily sap flow of sugar maple trees can be accounted for by a multiple linear regression of flow rate on (1) the number of hours during the day preceding the flow, when twig temperature was below 0[degree]C; (2) the total volume of flow oh the preceding day; (3) the number of degree-hours twig temperature was above a previous low, cumulated for the day of the flow; and (4) the serial number of the day of the flow. Of these, (1) is of most importance, indicating that preceding temperatures are more important than current temperatures in determining the amount of a flow.

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