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Effects of Nitrogen Fertilization on Growth and Ectomycorrhizal Formation of Red Oak

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Quercus rubra seedlings were grown for 100 days in a medium with and without vegetative inoculum of Pisolithus tinctorius. At 15 or 40 days after planting, nitrogen in the form of sodium nitrate or ammonium chloride was added to each container at rates of 0, 13.3, 26.6, or 53.2 mg nitrogen per seedling. At the end of the growing period all inoculated seedlings were ectomycorrhizal and all uninoculated seedlings were free of ectomycorrhizae. Ectomycorrhiza formation was enhanced with all rates of sodium nitrate when applied 40 days after planting. Growth of mycorrhizal seedlings did not differ from or was significantly less than that of comparably treated nonmycorrhizal seedlings. Leaf nitrogen content among all related treatments was not significantly different but leaf phosphorus content of mycorrhizal seedlings was significantly less than that of comparably treated nonmycorrhizal seedlings. Details of inoculum synthesis and a discussion of the probable influence of P. tinctorius, ectomycorrhizae, associated mycelia, and microflora on seedling growth and nutrient content are presented. Forest Sci. 26:529-536.

Keywords: Pisolithus tinctorius; Quercus rubra; containerized seedlings; ectomycorrhizae; greenhouse seedling production; inoculation

Document Type: Journal Article

Affiliations: Associate Professor of Forestry, Department of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

Publication date: December 1, 1980

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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