RYBÁRIK Adam, Bc.: The impact of type of planting material, the planting date, the application of fertilizer and hydrogel on the development of forest culture of beech and spruce (Diploma thesis) Thesis supervisor - doc. Ing. Ivan Repáč PhD., Technical University in Zvolen, Faculty of Forestry, Department of Silviculture. 2021, 60 s. Forests are currently exposed to extreme, adverse effects of harmful factors, which are manifested by their weakening and subsequent disintegration. These clearings are created in various habitat conditions and there are possibilities for the use of new progressive technologies in the artificial regeneration of the forest. The aim of the diploma thesis is to evaluate the development of planting of free-root and angiosperm seedlings of common spruce and beech in the calamitous area in the Strazov Mountains three years after its establishment. In this work the results of evaluation of the effect of application of Agrisorb hydrogel and Silvamix fertilizer on the survival rate, damage, growth and volume of the above ground part of seedlings are presented. The evaluation of plantings was performed after the second and third growing season. The average survival rate of seedlings after the second year was 68.3 % for spruce and 55.2 % for beech. After the third year, the survival rate was 65.6 % for spruce and 54.3 % for beech. The seedlings were damaged mainly by ratites. The highest height (68.8 cm) was reached by free-rooted spruce seedlings from the spring planting period with the application of Agrisorb hydrogel after the third growing season. The height gain was significantly lower for beech (13.9 cm) than for spruce (17.1 cm) after the third growing season. A statistically significant difference was found in free-rooted spruce seedlings in growth parameters (height, growth, volume of the above-ground part) after the third vegetation period. It has been shown the positive effect of Agrisorb hydrogel as well as Silvamix fertilizer in free-rooted spruce seedlings in comparison with seedlings from other variants within the combination of wood and the type of planting material.