Survival and Growth of Douglas-Fir Relating to Weeding, Fertilization, and Seed Source

Authors: Roth, Brian E.; Newton, Michael

Source: Western Journal of Applied Forestry, Volume 11, Number 2, 1 April 1996 , pp. 62-69(8)

Publisher: Society of American Foresters

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Abstract:

The goal of this study was to quantitatively evaluate the individual and interactive effects of weed control, nitrogen fertilization, and seed source on Douglas-fir (Pseudotsuga menziesii) survival and growth in a range of sites and growing conditions in western Oregon. Weed control was the dominant factor influencing seedling survival and growth and accounted for 49% of the explained variation in seedling volume after 2 yr. Nitrogen fertilization had no effect when used in conjunction with weed control and a negative effect when used without weed control. Seedlings from a seed orchard source were significantly larger in diameter and volume than those from a wild local source after two growing seasons, but second-year heights were similar for the two seedling types. Initial seedling size was positively correlated with growth rate. West. J. Appl. For. 11(2):00-00.

Document Type: Journal article

Affiliations: 1: Department of Forest Science, Oregon State University, Corvallis, OR 97331

Publication date: 1996-04-01

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