Eero Paavilainen

Typpilannoituksen tarve Pohjois-Suomen ojitetuilla rämeillä

Paavilainen E. Typpilannoituksen tarve Pohjois-Suomen ojitetuilla rämeillä.

Tiivistelmä

The aim of the study was to clarify, in what degree nitrogen is needed when fertilizing drained pine swamps in North Finland. Particular interest was laid on the fertilization of peatland types rich in nutrients. Further, the dependence of the fertilizer-induced growth reaction on ditch spacing and thickness of peat layer were considered. The growth reaction resulting from fertilization was estimated by measuring the annual height and radial growth on differently treated experimental plots and by using analysis of covariance. Further factors considered in the analysis were peatland type and its so-called sub-class, depth of peat layer, ditch spacing, age, height and diameter of the sample trees at the time of fertilization, and sample tree growth before fertilization. When fertilizing tall sedge pine swamps and more fertile pine swamps for the first time in Ostrobothnia, Kainuu and southern Lapland nitrogen deficiency seems not to be a minimum factor as regards the growth of Scots pine. On the other hand, it seems necessary to include nitrogen in the first fertilization treatment on less fertile pine swamps than mentioned above. According to the study, the growth of Scots pine subsequent to fertilization appears to be the better, the narrower the ditch spacing and the thinner the peat layer. More detailed information has been published by Paavilainen and Simpanen (1975).

Vastaanotettu 31.10.2017 Julkaistu 1.1.1975

Katselukerrat 1137

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