Suo - Mires and peat vol. 45 no. 4-5 | 1994
Viron soiden kemiallinen tutkimus.
English title: Chemical investigation of Estonian peat.
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Tekijät
Peat, alongside with oil shale, is one of the most important national energy resources of Estonia. Some 9836 peatlands cover 22.3 per cent of the Estonian territory. Peat resources exceed 2.37 billion tons. The chemical composition of Estonian peat was studied as early as in the 1920's. At the end of the 1930's some experiments on peat coking were carried out. Later on the chemical content of peat was studied by the Geological Survey of Estonia. An experimental plant for producing fodder yeast has been established, and attempts made to extract growth stimulators from peat. An experimental plant for the production of activated coal is under construction.
Key words: Estonia, peat chemistry, peat technology
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Veski,
Peat Info Ltd., Söpruse 233-48, EE0034 Tallinn, Estonia
Sähköposti:
ei.tietoa@nn.oo
- Mall, Sähköposti: ei.tietoa@nn.oo
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
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