Date of Award

2003

Level of Access

Open-Access Thesis

Degree Name

Master of Science (MS)

Department

Forest Resources

Advisor

Robert G. Wagner

Abstract

The long-term effect on the development of spruce-fir stands in Maine from combinations of herbicide (Glyphosate, Triclopyr, 2,4-D, 2,4,5-T, MSMA, Picloram, Water, and Control) and precommercial thinning (PCT and no PCT) treatments was examined 22 years after herbicide application and 13 years after PCT. The mean IRR for the herbicide treatments with no thinning was 8.2%. For PCT only the IRR was 6.3%. The mean IRR for plots receiving both herbicide and PCT treatments was 5.8%. Therefore, the rate of return for both herbicide and PCT and combinations of the two treatments would be acceptable to many investors.

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