Liriodendron tulipifera L. seedlings were grown under greenhouse conditions and inoculated with the endomycorrhizal fungi Glomus fasciculatum (Thaxter) Gerdemann & Trappe or G. mosseae (Thaxter) Gerdemann & Trappe. Inoculated and non-inoculated plants were grown in highly fertile medium of perlite : sphagnum peat moss : loam soil (2:2: 1, by volume with 120 mg/l NO3, 53 mg/l P, 130 mg/l K, and 12 mg/l NH4) and were watered as needed with nutrient solution (516.6 mg/l KNO3, 367.6 mg/l NH4NO3, and 0.124 ml/1 of 75% H3PO4). Both fungal species successfully promoted plant growth under these conditions, but G. mosseae tended to be more effective at promoting growth.

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Author notes

Journal Paper No. 9875 of the Agricultural Experiment Station, Purdue University, West Lafayette, IN 47907, U.S.A. Prepared as part of an investigation by the Joint Highway Research Project, Engineering Experiment Station, Purdue University, in cooperation with the Indiana State Highway Commission and the U.S. Department of Transportation Federal Highway Administration. Research also supported in part by a grant from the Horticultural Research Institute.

2Former Graduate Student of Horticulture; Present address: University ofFlorida, Fort Lauderdale Research and Education Center, 3205 College Avenue, Fort Lauderdale, Florida 33314.

3Former Associate Professor of Horticulture; Present address: American Association of Nurserymen, 1250 I Street, NW, Suite 500, Washington, D.C. 20005.