Suo - Mires and peat vol. 43 no. 2 | 1992
Kalilannoituksen vaikutus männyn kasvuun ja ravinnetilaan.
English title: Effect of potassium fertilization on the growth and nutrition of Scots pine.
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This paper is based on four experiments established in 1960-1969. There were four sources of potassium: potassium chloride, double salt of potassium and magnesium sulphates, cement potassium and potassium sulphate. The application rates of fertilizer potassium varied from 0 to 664 kg/ha as pure element. Nitrogen and phosphorus or phosphorus alone were also given at the beginning. The experiments were inventoried in 1988. The peat potassium amounts were independent of the application rate. On the other hand, the foliar potassium concentrations were the higher the higher the application rate. Yet, the effect of currently used potassium fertilizer rate, (about 80 kg/ha of K), on the foliar potassium concentrations did not significantly differ from the effect of the double rate. Fertilization increased the basal area growth for 8-22 years, after which the growth started to decline. The reason can at least partly be attributed to the shortage of potassium. The growth response was independent of the potassium source and rate on the potassium fertilized plots.
Key words: Foliar nutrients, peatland, peat nutrients, Pinus sylvestris
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Kaunisto,
The Finnish Forest Research Institute, Parkano Research Station, SF-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
Uuttuva sinkki viljellyissä eloperaisissa maissa.
English title: Extractability of zinc in cultivated organic soils.
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The AAAc-EDTA extractable Zn content in mould soils (2,3±2,0 mg/ l soil) was not dependent on the total Zn content. In peat soils the extractable Zn content (2,0±1,9 mg/l soil) increased with the increase in total Zn content. The proportion of extractable Zn to the total Zn was less than 8% in Zn deficient mould soils but about 40% in Zn sufficient mould soils. In peat soils the corresponding proportions were 30% and 60%. In mould soils the increases in humus content and acidity caused an increase of AAAc-EDTA extractable Zn. In peat soils extractable Zn content increased with increasing humus content up to 65%. The extractable Zn content was highest between pH values 5,0 and 5,5.
Keywords: Extractable zinc, humus content, mould soil, peat soil, pH, total zinc
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Urvas,
Agricultural Research Centre of Finland, Institute of Soils and Environment, SF-31600 Jokioinen, Finland
Sähköposti:
ei.tietoa@nn.oo
- Jokinen, Sähköposti: ei.tietoa@nn.oo
- Hyvärinen, Sähköposti: ei.tietoa@nn.oo
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