Risto Lauhanen , Mikko Moilanen, Klaus Silfverberg, Heikki Takamaa, Jorma Issakainen

Puutuhkalannoituksen kannattavuus eräissä ojitusaluemänniköissä

Lauhanen R., Moilanen M., Silfverberg K., Takamaa H., Issakainen J. Puutuhkalannoituksen kannattavuus eräissä ojitusaluemänniköissä.

Tiivistelmä

The profitability of wood ash-fertilizing (5-16 t ha-1) of four drained peatland Scots pine stands in central Finland was investigated. The profitability of forest drainage alone and forest drainage plus ash-fertilization was compared. After 44-56 years, the wood ash-fertilization had increased mean productivity by 3.1-12.1 m3 ha-1 a-1. Using an interest rate of 3 % and without subsidies, the net present value of the stands was 2500-20300 FIM ha-1 higher as a result of the ash-fertilization than the value given by forest drainage alone. The real internal rate of return due to ash-fertilization without subsidies was 3.7-9.3 %. The interest rate, the fertilization dose and related costs, and the stumpage prices affected profitability. The state forest improvement subsidies further increased the profitablity of ash-fertilization. Key words: forest fertilization, internal rate of return, net present value, Scots pine, stem volume, wood ash

Avainsanat
Scots pine; wood ash; forest fertilization; internal rate of return; net present value; stem volume

Vastaanotettu 31.10.2017 Julkaistu 1.1.1997

Katselukerrat 2235

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