The purpose of the master's thesis was to determine what has been the collective effect of the tree's green pruning to the vegetative growth (the circumference of the trunk; the growth of the branches), number and quality of fruits (diameter, weight, flesh firmness, the content of total soluble solids and starch) and time of green and winter pruning. The green pruning was performed on the apple tree (Malus domestica Borkh.) on cultivars ´Red Topaz´ and ´Pinova´. The new apple tree orchard experiment was conducted and administered at experimental field of Biotechnical Faculty from 2016 to 2018. In the experiment we examined the differences between the trees on which we performed green pruning and subsequently the trees on which the same process was not performed (the control). According to the results obtained we shall conclude that the green pruning has a positive effect on the growth of the branches (less intensive growth) and on a larger number of fruits. Green pruning does not have a significant effect on the quality of the fruits on both cultivars because that is what it distincts between the treatments which are relatively insignificant. Average time of the green pruning on cultivar ´Red Topaz´ was in first year 26 sec/tree, second year 49 sec/tree and in third year 52 sec/tree. Average time of the green pruning on cultivar ´Pinova´ was in first year 12 sec/tree, second year 38 sec/tree and in third year 25 sec/tree. The average time of winter pruning's treatment was much shorter on both cultivars (this was where we conducted the green pruning). On cultivar ´Red Topaz´ was the difference between the time we spent on winter pruning between control and treatment, where we conducted the green pruning in 2017 2 seconds/tree and in 2018 13 sec/tree. On cultivar ´Pinova´ was in year 2017 a difference between control and treatment, where we conducted the green pruning 5 sec /tree and in 2018 13 sec/tree
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