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Leo Heikurainen (email), Jukka Laine

Duration of the height growth response of young pine stands to NPK-fertilization on oligotrophic pine bogs in Finland.

Heikurainen L., Laine J. (1985). Duration of the height growth response of young pine stands to NPK-fertilization on oligotrophic pine bogs in Finland. Silva Fennica vol. 19 no. 2 article id 5237. https://doi.org/10.14214/sf.a15416

Abstract

This is the latest report in a series of publications from an on-going investigation which is concerned with the influence of different fertilization treatments and ditch spacings on the growth of Scots pine (Pinus sylvestris L.) seedlings and transplants growing on nutrient drained poor bogs in different parts of Finland. This paper concentrates on duration of the growth response to NPK-fertilization on the experimental plots. The experiment was established and the treatments performed in 1965–66.

The results show that climate, expressed as effective temperature sum (dd°C, threshold +5°C) has a clear influence on the duration of the fertilization effect. In Southern Finland (>1,200 dd°C), the duration was at least 15 years. In Central Finland (1,200–1,000 dd°C), it appears to be almost 10 years, and in Northern Finland (<1,000 dd°C), slightly shorter. The amount of fertilizer applied clearly influenced the duration of the fertilization effect. The dosage of 500 kg/ha (N 14, P 7.8, K 8.3 per cent) had, on average, a shorter duration than the greater dosages of 1,000 and 1,500 kg/ha. However, there was no clear difference between the latter two dosages.

The PDF includes a summary in Finnish.

Keywords
Pinus sylvestris; fertilization; drained peatlands; Scots pine; Finland; climate; growth; degree days

Published in 1985

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Available at https://doi.org/10.14214/sf.a15416 | Download PDF

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