Influence of titanium and silicon based preparations on the yield of pear (Pyrus communis L.) cultivar ‘Williams’ was investigated at the Horticultural Center of the Biotechnical Faculty at Orehovlje in the Goriška region in 2018. We wanted to check the effect of two products, Tytanit and Optysil, on the fruit quality and their pomological properties. We assumed that the use of titanium before flowering increases the quality of the fruit, which means that the fruit firmness will be higher, as well as the content of total soluble solids and the use of silicon immediately after flowering will have a positive effect on the pomological properties of the fruit of the pear cultivar 'Williams'. Tytanit, Optysil and these two together were added foliarly to the plants and we also had control trees that were not treated. The harvested fruits were counted, the yield was weighed, the yield coefficient was calculated and the pomological properties of the fruits were measured. We found that Tytanit had a positive effect on the average fruit firmness and total soluble solids, as well as on the better fruit coloring and thus on the better fruit quality. The use of both products at the same time (Tytanit and Optysil) had a positive effect on fruit width and weight, product Optysil had a positive effect on the fruit height of 'Willams' pears cultivar. Tytanit and Optysil preparations did not affect the yield.
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