The experiment described was established in 1974 in the Wronki Forest Inspectorate, the Smolnica Forest District. The conditions of this plot were described as dry pine forest site and the growth of Scots pine was analyzed in a 25-year-old stand, growing on the plot with different soil preparation. After 25 years a positive influence of these treatments on the taxation features (diameter at breast height, height and volume) of Scots pine, intensity of self thinning and biological structure were analyzed. The obtained results were then elaborated statistically.

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