The effect of fertilization on the height or thickness growth of young Scots pine stands on drained pine bogs was investigated in the study. The material was collected from 25 fertilization field experiments located in Central Finland. The fertility status of the sites varied between cotton grass and sedge-rich peatland site types. The effect of powdered PK-fertilizer on stand growth was rather small and there were only slight differences between the response to different PK-doses (200-1 000 kg/ha). The nitrogen fertilizers had a clear effect on stand growth over a period ranging from 5 to 8 years. Ammonium nitrate with lime gave, on the average, a slightly better growth increase than urea but, in practice, the difference was meaningless. The nitrogen-dosage experiment carried out on a thin-peated, nitrogen deficient pine bog showed that the doses of 150-200 kg N/ha gave the highest growth increase.
