The purpose of this graduation thesis was to determine whether silicon- and titanium- based biostimulants affect the yield of pear (Pyrus communis L.) cultivar 'Williams'. We wanted to find out which biostimulants, silicon or titanium, have a more favourable effect on the quantity and quality of pear cultivar 'Williams'. The experiment took place in a pear orchard in the Horticultural Center of the Biotechnical Faculty (HC BF) and Zagaj (Bistrica ob Sotli) in 2019. We measured the parameters of vegetative growth and generative development of trees. Tytanit had a beneficial effect on the number of fruits and yield. Optysil had a positive effect on fruit width at both locations, as the fruits were the widest in this treatment. In Zagaj, the biostimulants Tytanit and Optysil affected higher number of fruits/tree, higher yield/tree, higher firmness and lower fruit height, fruit weight and titratable acid content. Tytanit and Optysil also affected higher number of fruits/tree and yield/tree, fruit height, soluble solids content and titratable acid content at the HC BF location.
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