The time has come for conversion of low productivity karst pine forests. In order to determine the suitability of tree species, 6 experimental plots were established in 2012 near Divača. Three plots were located in a more productive site on flat terrain and three on the less productive site on the slope. The following tree species were planted on all plots: Celtis australis L., Quercus petraea (Mattuschka) Liebl., Fagus sylvatica L., Prunus avium L., Juglans regia L. and Acer pseudoplatanus L. The first measurements were made in 2013 after first growing season. They were repeated and expanded in 2017 after four growing seasons since planting. The height of seedlings, increment, stem diameter 5 cm above the ground, vitality and quality were measured or estimated. In addition, a soil analysis has been made. After re-measuring in 2017, the success of survival of the seedlings was surprisingly high according to the site conditions, because 70 % of all planted seedlings survived. The most successful species so far was P. avium, while F. sylvatica was the least successful. Acer pseudoplatanus was the most susceptible to poor field conditions, as it had the largest difference in the survival rate between the plots.
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