Artikkelit jotka sisältää sanan 'Critical concentration'
Ojitettujen suokuusikoiden ravinnetarpeen määritys neulasanalyysillä.
English title: Nutritional diagnosis of Norway spruce stands growing on drained peatlands using foliar analysis.
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The purpose of this study was to determine critical nutrient concentration values for interpreting foliar analysis of Norway spruce stands growing on drained peatlands. During 1987–91, a total of 162 spruce needle samples from various peatland sites in Finland were taken and analysed for N, P, K, Ca, Mg, B, Cu, Fe, Mn and Zn. The mean height growth of the two preceding growing seasons was used as the growth parameter for multiple and simple regression analyses. Foliar concentrations significantly explained height growth. Simple regression analysis was used to estimate the following critical values indicating severe to moderate nutrient deficiencies for the main nutrients: N 1.15–1.30%, P 1.70–2.30 mg g-1 and K 5.40–6.60 mg g-1. Also the following tentative critical concentrations are suggested: Cu 2.0 mg kg-1, Fe 13.0 mg kg-1, Mg 0.80 mg g-1 and Zn 16.0 mg kg-1. Results for B are in accordance with previous, but unsubstantiated, critical values (6–8 mg g-1).
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Veijalainen,
The Finnish Forest Research Institute, Vantaa Research Centre, P.O. Box 18, FIN-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
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