Search for: [Abstract = "The urgency of conversion of primary dump stands with regard to the tree species exists in the decreasing order\: poplar, birch and Scots pine. While conversion of young primary pine forests into mixed broad\-leaved forests is not advisable because of unfavourable site conditions, suitable timber stands on dumps represent favourable pioneer crops appropriate for conversion. Derived from investigations practical advises are given about kind, strength and time of preparatory thinning for under planting and ongoing thinning. The nutrition potential of the soil substrate has to be considered. Furthermore, height growth and leave mass of under planted oaks are indicators for the forest treatment."]

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