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Growth and nitrate reductase activity in Juniperus oxycedrus subjected to organic amendments and inoculation with arbuscular mycorrhizae

AuthorsCaravaca Ballester, María Fuensanta ; Alguacil García, María del Mar ; Díaz, Gisela; Marín, Purificación; Roldán Garrigos, Antonio
KeywordsArbuscular mycorrhiza
Dry olive cake
Nitrate reductase
Sewage sludge
Issue Date18-Aug-2006
PublisherJohn Wiley & Sons
CitationJournal of Plant Nutrition and Soil Science 169(4): 501-505 (2006)
AbstractThe effectiveness of reforestation programs on degraded soils in the Mediterranean region is frequently limited by a low soil availability and a poor plant uptake and assimilation of nutrients. While organic amendments can improve the nutrient supply, inoculation with mycorrhizal fungi can enhance plant nutrient uptake. A pot experiment was conducted in 2004 to study the influence of inoculation with an arbuscular mycorrhizal (AM) fungus (Glomus intraradices Schenck & Smith) or with a mixture of three AM fungi (G. intraradices, G. deserticola Trappe, Bloss. & Menge, and G. mosseae (Nicol & Gerd.) Gerd. & Trappe) and of an addition of composted sewage sludge or Aspergillus niger-treated dry-olive-cake residue on plant growth, nutrient uptake, mycorrhizal colonization, and nitrate reductase (NR) activity in shoot and roots of Juniperus oxycedrus L. Six months after planting, the inoculation of the seedlings with G. intraradices or a mixture of three AM fungi was the most effective treatment for stimulating growth of J. oxycedrus. There were no differences between the two mycorrhizal treatments. All treatments increased plant growth and foliar N and P contents compared to the control plants. Mycorrhizal inoculation and organic amendments, particularly fermented dry olive cake, increased significantly the NR activity in roots.
Publisher version (URL)http://dx.doi.org/10.1002/jpln.200520535
Appears in Collections:(CEBAS) Artículos
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