Treesearch

The purpose of this paper is to furnish part of the needed information, that is, quantitative estimates of growth and yield 10 years after initial thinning of upland oak stands. All estimates are computed from a system of equations. These predictions are presented here in tabular form for convenient visual inspection of growth and yield trends. The tables show growth and yield in terms of basal area, total cubic-foot volume, cordwood volume, and board-foot volume over a broad range of site, age, and residual stand density classes.

The research unit of the Northeastern Forest Experiment Station at Burlington, Vermont, has been doing research on methods of installing tubing since 1966. We have studied several ways of hanging tubing and have found that there are certain techniques to use if plastic tubing is to be installed and to operate successfully.

Growth of red oak seedlings was examined in relationship to various levels of nitrogen (N), phosphorus (P), and potassium (K) supplied singly and in all combinations to forest soils from the Barbour series. Results showed that seedling growth was significantly affected by NxP and NxPxK interactions; and that, without nitrogen, P and K alone or in combination with each other did not increase growth. These findings suggest that NxP and NxPxK interactions should be considered in designing fertilization tests on soils that have P and K levels similar to or lower than those tested in this study.

Changes may take place rapidly in young forest stands. Stands that appear good may deteriorate unexpectedly: stands that hold little promise initially may suddenly show great potential. The ability to understand and predict such changes increases our ability to prescribe effective silvicultural treatments.

Those who attended the Forest Recreation Symposium held 12-14 Octoher 1971 at Syracuse, New York, heard 26 papers about various aspects of forest recreation. Those papers have already been printed, in Proceedings made available at the Symposium, and also available upon request from the Northeastern Forest Experiment Station, 6816 Market Street, Upper Darby, Pa. 19082 This paper contains the welcoming remarks, the keynote address, the banquet speech, and a summary of the papers-thus completing the record of the Symposium.

The findings of a 1971 census of commercial camping enterprises in New Hampshire, including the growth of commercial camping enterprises during the period 1960-71, the average per-site costs and returns for operating a campground in 1970, and the characteristics of 78 successful and 89 unsuccessful camping enterprises.

The undersize and underinflated tire is one of the costliest problems in Appalachian logging. Overloaded and underinflated tires cause excessive wear and expensive early replacement. In seeking a solution to this problem, we have developed a method that can be used for choosing the correct tire size and inflation pressure for a particular skidder.

Observations made on the Fernow Experimental Forest in West Virginia indicate that some black cherry seeds remain viable in the forest floor over three winters. On the average fewer than 10 percent of the seeds stored in the forest floor germinated the first spring, about 50 percent germinated the second spring, and 25 percent germinated the third spring.

The U. S. maple tariff is a tax on maple syrup and sugar imports from Canada into the United States. An analysis of the maple tariff indicates that it was never very effective in protecting the domestic maple industry from foreign competition. The tariff has been especially ineffective since World War II. Its removal will not hurt the U. S. maple syrup industry.