Artikkelit jotka sisältää sanan 'tree growth'
Puuston kasvu ja ravinteiden saatavuus turvemaiden vanhoilla kalkituskokeilla.
English title: The growth of Scots pine and the availability of nutrients in old Finnish liming experiments on drained peatlands.
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Liming (with applications of 1 000 to 8 000 kg ha1) had no long-term (1929-1985) effect on the growth of Scots pine on drained oligotrophic peatlands. Liming plus NPK fertilization had a variable effect on the growth of the stands. The same treatment could result in a very different response in different experimental areas. Both liming alone and liming plus NPK fertilization increased the calcium, magnesium and nitrogen contents of peat and decreased the C/N ratio and acidity. Liming plus fertilization decreased needle boron and manganese and increased calcium and nitrogen concentrations. The results of peat and needle analysis indicated that the changes in nitrogen availability to trees caused by liming have not been sufficient enough to affect tree growth. It was also concluded that boron deficiency was the main reason for the lowered yield.
Key words: fertilization, needle nutrients, peat nutrients, Pinus sylvestris, tree growth
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Nieminen,
The Finnish Forest Research Institute, P.O. Box 18, FIN-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
- Pätilä, Sähköposti: ei.tietoa@nn.oo
Turpeentuhkan vaikutuksesta puuston kasvuun ja ravinnetilaan käytännön lannoitustyömailla.
English title: Growth and foliar nutrients in peat-ash fertilized stands.
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This study included growth and needle analysis in ash-fertilized spruce and pine stands near Oulu (65 °N, 26 °E). Most of these stands, totalling 770 measured trees, were on peat and fertilized in wintertime 1980 and 1981 as practical work with 40 m3/ha. By 1985 there was a clear increment of growth, especially in spruce stands, probably due to the great amount of phosphorus (375 kg/ha) applied.
Keywords: peatland forestry, tree growth, ash-fertilization, phosphorus.
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Silfverberg,
Department of Peatland Forestry, The Finnish Forest Research Institute, Unioninkatu 40 A, 00170 Helsinki, Finland
Sähköposti:
ei.tietoa@nn.oo
- Issakainen, Sähköposti: ei.tietoa@nn.oo
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