Effects of Nitrogen Fertilization on Growth and Ectomycorrhizal Formation of Red Oak
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.
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Document Type: Journal Article
Affiliations: Associate Professor of Forestry, Department of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Publication date: 1980-12-01
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