Abstract
Growth of young Norway spruce plantations on quartz-porphyry sites can be improved by applying phosphorus fertilizer as this acid parent rock is extremely poor in phosphorus. If fertilization is performed in connection with reforestation, the increment in height and volume of the developing crop increases for a period of about ten years. Additional liming prolongs the duration of the P-fertilization effect up to 20 years. Liming stabilizes phosphorus in an available form in the humus layer and upper soil horizon. Nitrogen deficiency occurs only 10 to 15 years after planting and N applied up to then has no positive effect on spruce growth.
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