Seppo Kaunisto

Kalilannoituksen vaikutus männyn kasvuun ja ravinnetilaan

Kaunisto S. Kalilannoituksen vaikutus männyn kasvuun ja ravinnetilaan.

Tiivistelmä

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

Avainsanat
peatland; Foliar nutrients; peat nutrients; Pinus sylvestris

Vastaanotettu 31.10.2017 Julkaistu 1.1.1992

Katselukerrat 473

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