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Sewage Sludge and Pisolithus tinctorius Ectomycorrhizae: Their Effect on Growth of Pine Seedlings

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Four levels of dried sludge (0, 69, 138, and 275 metric tons/ha) and infestation of soil with the fungal symbiont Pisolithus tinctorius or control inoculum were combined factorially in heavy clay soil from a severely eroded site to determine their effects on growth of Pinus taeda and P. echinata seedlings. Addition of sludge to soil caused highly significant increases in growth of both pine species. Seedlings of both pine species with Pisolithus ectomycorrhizae were significantly taller than those with ectomycorrhizae formed by naturally occurring fungi. Loblolly pine seedlings with Pisolithus ectomycorrhizae also had significantly greater stem diameters and foliar and root fresh weights than control seedlings. Foliar zinc increased and foliar aluminum decreased with increased sludge levels. Loblolly seedlings with Pisolithus ectomycorrhizae also had significantly less foliar zinc than control seedlings. There were no correlations between sludge levels or Pisolithus ectomycorrhizae and amounts of 13 other elements in the foliage. The effects of Pisolithus ectomycorrhizae were greatest at the intermediate sludge level (138 tons/ha) on both loblolly and shortleaf pine seedlings. Based on these results, the interaction of dried sewage sludge with Pisolithus ectomycorrhizae appears to have valuable potential in the improvement of pine growth on eroded forest sites. Forest Sci. 22:351-358.
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Keywords: Nutritional disorder; Pinus echinata; Pinus taeda; site reclamation

Document Type: Journal Article

Affiliations: Chief Plant Pathologist, USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Carlton Street, Athens, Georgia 30602

Publication date: 1976-09-01

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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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