Profitability of Repeated Fertilization on Mineral Soils

1989

20 S.

4 Abb., 2 Tab., 21 Lit. Ang.

Bandaufführung

37224

The profitability of repeated fertilization in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) stands was examined based on experimental plots and on the models which were also based on those plots. The plots were located on mineral soils in southern Finland and thus the results also apply for the same geographical area and soils. The output of repeated fertilization was considered as the differences between the stumpage price values of fertilized and unfertilized experimental plots and the corresponding difference of the timber harvested during the investigated period. The stumpage prices were calculated from linear price models describing the development of annual stumpage prices in southern Finland during the period 1978-1987. The costs of fertilization were calculated by summing upt the cost of fertilizer, planning and supervising, transportation and spreading. The profitability of repeated fertilization was measured by the real internal interest. The influence of state support in the form of straight subsidies and low interest loans, as well as the influence of taxation upon profitability were studied. The results proved that repeated fertilization a profitable investment regardless of how it is financed.