The use of organic and mineral fertilizers in reforestation and in revitalization of declining protective forests in the Alps |
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Authors: | G Glatzel K Haselwandter K Katzensteiner H Sterba J Weißbacher |
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Institution: | 1. Institute of Forest Ecology, Universitaet fuer Bodenkultur, Peter Jordanstr. 82, A-1190, Vienna, Austria 2. Institute of Microbiology, University of Innsbruck, Sternwartestr. 15, A-6020, Innsbruck, Austria 3. Institute of Forest Yield Science, Universitaet fuer Bodenkultur, Peter Jordanstr. 82, A-1190, Vienna, Austria
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Abstract: | BIOSOL and BACTOSOL, organic fertilizers based on residue from commercial antibiotic production, were tested as an alternative
to mineral fertilizers in reforestation and in revitalization of Norway spruce stands (Picea abies) affected by forest decline. Due to its slow release of N and its stimulation of root growth, the organic fertilizer was
superior to mineral fertilizer in enhancing growth of spruce planted in nutrient poor soil with low nutrient retention capacity,
especially when combined with magnesium carbonate fertilizer. In mature stands, basal area increment responded positively
and significantly to both mineral fertilizer and BIOSOL. So far no pronounced effects of fertilizer treatment on seed production
and viability were observed. Fertilization in the moderate amounts employed had no adverse effects on microbial activity in
the soil and mycorrhizal status and thus seems to be a safe method to increase tree vigor without dramatically changing site
parameters. |
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