Effects of Fertilization and Vesicular-Arbuscular Mycorrhizal Inoculation on Growth of Hardwood Seedlings

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Kormanik, Paul
Bryan, William
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Schultz, Richard
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The forestry major prepares students to apply scientific principles to forests, including management, conservation and restoration of forest ecosystems as well as provision of wood and non-wood products from forests. Students first enroll in courses in biology, math and environmental sciences to prepare for upper-level courses in forestry. As they become more familiar with forests and forest management, students can choose one or more of four options in which to pursue advanced coursework. The educational programs in Forestry (Options in Forest Ecosystem Management, Natural Resource Conservation and Restoration, and Urban and Community Forestry) leading to the degree B.S. in Forestry are candidates for accreditation by the Society of American Foresters (SAF) under the forestry standard. The program in forestry provides you with an understanding of the following areas: forest ecosystems, wood technology and products, forest resource management, agro-forestry, urban and community forestry, biodiversity, water quality, wilderness areas and wildlife.
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Eight hardwood species were grown in fumigated soil without vesicular-arbuscular mycorrhizae (VAM) or in soil infested with a mixture of Glomus mosseae and Glomus etunicatus. Three fertilizer treatments of 140, 560, and 1,120 kg/ha of 10-10-10 fertilizer were established in combination with the two mycorrhizal treatments. Ten equal applications of NH4NO3, totaling 1,680 kg/ha, were added to all the treatment plots during the growing season. For six of the eight species, the VAM seedlings showed greater height and diameter growth and dry weight production than nonmycorrhizal seedlings. Sugar maple (Acer saccharum Marsh.) and walnut (Juglans nigra L.) displayed no height growth differences. Only boxelder (Acer negundo L.), of the inoculated seedlings, consistently responded to increases in fertilizer level. Nonmycorrhizal seedlings generally showed increased growth with increased fertilizer applications. The growth of the nonmycorrhizal seedlings at the higher fertilizer levels was not sufficient to produce plantable seedlings for artificial regeneration. A difference in host preference for the Glomus spp. symbionts is suggested by the large difference in infection between species. Infection values varied from a high of about 80% for sycamore (Platanus occidentalis L.), green ash (Fraxinus pennsylvanicaMarsh.), and boxelder to a low of 40% for sugar maple and sweetgum. The growth data suggest that high quality seedling stock of most of these hardwood tree species can be obtained in nurseries as long as cultural practices in the nursery encourage VAM development.


This article is from Soil Science Society of America Journal 45 (1981): 961.