The aim of this graduation thesis was to determine the influence of silicon and titanium products on the quantity and quality of pear (Pyrus communis L.) cultivar 'Williams'. The experiment was performed in 2020 in the Horticultural Center of the Biotechnical Faculty in Orehovlje. In the first treatment, foliar spraying of the trees was performed using Tytanit, which contains Ti, in the second treatment Tytanit + Optysil (Si) were used, the third treatment was performed with Optysil. The fourth treatment was for control and trees were left untreated. The trunk circumference of all trees was measured and the number of flower clusters/tree was counted. After harvest, the fruits were sorted according to their diameter in first and second quality class, the number of fruits per tree was counted and the yield for each tree was weighted separately. Measurements of the fruit height and width, weight, firmness and soluble solids content were performed; ground and cover colour parameters were determined. It was established that Tytanit had a positive effect on the soluble solids content and increased the flesh firmness. The higher content of soluble solids was also achieved with Optysil and the combination of Tytanit + Optysil. The trees treated with Tytanit and Optysil had a lower yield. The yield (t/ha) was 12,1 tones lower in trees treated with Tytanit compared to control (untreated) trees.
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