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Urea Fertilization: Effects on Primary Root Mortality and Mycorrhizal Development of Young-Growth Western Hemlock

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Urea fertilization of hemlock stands increases mortality of mycorrhizae and changes relative populations of mycorrhizal types. The magnitude of this fertilizer-induced mortality varies among stands as a function of vertical distribution of mycorrhizal numbers and types. Thus, the differential growth among hemlock stands after nitrogen fertilization may be due, at least in part, to differences in hemlock's primary roots. Forest Sci. 29:751-760.

Keywords: Tsuga heterophylla; mycorrhizae; nitrogen fertilizer response

Document Type: Journal Article

Affiliations: Professor of Forest Science, School of Forestry, Oregon State University, Corvallis, OR 97331

Publication date: December 1, 1983

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