In the graduation thesis we wanted to determine whether the use of titanium and silicon increases the quality of fruit and yield of the peach cultivar 'Redhaven'. The experiment, which took place at the Horticultural centre of the Biotechnical Faculty in Orehovlje, Miren, included 4 treatments: sprayed with Optysil biostimulant, sprayed with Tytanit biostimulant, sprayed with Optysil and Tytanit biostimulants, and control. We picked up the fruit in four harvests as the peaches ripen gradually. We counted the number of fruiting branches per tree, the number of fruit per tree, and weighed the yield for each tree separately. The fruit height, width and thickness, the weight of the fruit and the stone, the flesh firmness, the soluble solids content and the titratable acids content, and the parameters of the basic and cover colour of the fruit were measured. We found that the use of Optysil improves most of the measured quality parameters (with the exception of flesh firmness and titratable acid content). When spraying the fruits with the combination of both biostimulants, improvement was observed in only a few parameters (fruit size and weight, and titratable acid content). The use of Tytanit improved only the fruit size compared to the control fruit.
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