Variation of Sugar Maple Sap Yield and Its Influence on Experimental Design
Variation of Sugar Maple Sap Yield and Its Influence on Experimental Design

Author: Barton M. Blum

Publisher:

Published: 1968

Total Pages: 12

ISBN-13:

DOWNLOAD EBOOK

S2When sap production research was begun by the Northeastern Forest Experiment Station in Burlington, Vermont, in 1964, it became apparent that more quantified information on sap yield variation among individual trees and among years was needed to facilitate the designing of efficient experiments. One of the first projects undertaken was to record seasonal sap yields on approximately 140 individual trees on a sugarbush near Jericho, Vermont. Yields were measured in the sap seasons of 1965, 1966, and 1967. Data presented in this report are based for the most part on a random sample drawn from these trees. All sample trees were tapped with two tapholes bored to a uniform depth.S3.

The Effect of Xylem Age on Volume Yield & Sugar Content of Sugar Maple Sap
The Effect of Xylem Age on Volume Yield & Sugar Content of Sugar Maple Sap

Author: Carter Bradley Gibbs

Publisher:

Published: 1969

Total Pages: 16

ISBN-13:

DOWNLOAD EBOOK

At the Burlington, Vermont, research unit of the Northeastern Forest Experiment Station, a study was begun in 1966 in an effort to identify the portions of the xylem that produce the most sap and the sap with the highest sugar content. The study revealed that the greatest volume of sap comes from xylem that is about 35 years old, and that the sweetest sap comes from the young xylem just beneath the bark.

Sap Yields from Fall and Spring Tapping of Sugar Maple
Sap Yields from Fall and Spring Tapping of Sugar Maple

Author: Melvin Ray Koelling

Publisher:

Published: 1968

Total Pages: 12

ISBN-13:

DOWNLOAD EBOOK

S2Some maple sap producers have wondered whether they could increase the total sap yields by tapping their trees not only in the spring but also in the fall too. Our research indicates that tapping in the fall cannot be recommended. Our study of fall tapping was begun in November 1964. Fall tapping was at least theoretically possible because temperature fluctuations like those of the normal spring tapping season occur to some extent in late fall and early winter. However, it was not known whether the volume and sugar concentration of fall-produced sap would be adequate to make such a practice feasible. Nor did we know whether fall tapping would affect the normal spring sap production from fall-tapped trees. The study reported here was set up to answer these questions. S3.

Vacuum Pumping Increases Sap Yields from Sugar Maple Trees
Vacuum Pumping Increases Sap Yields from Sugar Maple Trees

Author: Barton M. Blum

Publisher:

Published: 1968

Total Pages: 18

ISBN-13:

DOWNLOAD EBOOK

S2In the spring of 1967, a vacuum pump was installed at a sugarbush located in Underhill, Vermont. This work proceeded in two phases: an individual-tree study designed to determine if sap could be drawn out of a tree in sufficient quantities to account for large yield differences; and a large-scale study of the effects of sustained levels of vacuum on yields from a nearly commercial-size network of tubing. S3.

A Comparison of Four Survey Techniques Used in Outdoor Recreation Research
A Comparison of Four Survey Techniques Used in Outdoor Recreation Research

Author: Elwood L. Shafer

Publisher:

Published: 1967

Total Pages: 420

ISBN-13:

DOWNLOAD EBOOK

S2Because of the great and growing interest in outdoor recreation, many studies are being made by private and public agencies that need information for planning use of land and facilities for recreational purposes. In these studies much attention is being given to the people who use recreational facilitieswho they are; where they come from; what they like; what they want; how much they are willing to spend. Many types of surveys are being used in studying these people. The main question in planning a survey of this sort is: What survey technique can be used that will provide the most reliable and valid results at the least cost? To get an answer that we could use in our recreation research program, we made a study of four different survey techniquesa personal interview, a handout questionnaire, an immediate mail questionnaire, and a delayed mail questionnaire. Results show that the delayed mail survey, conducted 3 months after the camping experience, gets the best results at the least cost. Our study is described here for the benefit of other research workers in outdoor recreation.S3.