Due to the decline in peach production in Slovenia and the desire for greater peach production, we think it makes sense to try the use of various technological measures, including use of biostimulants. We wanted to test and determine the effects of silicon- and titanium-based biostimulants on peach (Prunus persica L.) cultivar 'Redhaven'. The experiment was carried out at the Horticultural Center of the Biotechnical Faculty in 2020, which included four treatments: spraying trees with Tytanit, spraying trees with Tytanit+Optysil, spraying with Optysil and control. We counted the fruiting branches of the trees and measured the trunk circumference 20 cm above the grafting point. We adjusted the harvest to the ripening of the fruit and we needed four harvests. We picked each tree separately, counted the number of fruits, and weighed them. We randomly selected a representative sample on which we made measurements of height, width, thickness, fruit weight, fruit firmness, soluble solids content and titratable acid content, stone weight and parameters of ground and cover colour of the fruit. We found that Optysil and Tytanit had a positive effect on yield, and fruits treated with Optysil had the highest fruit firmness. The reduction of the titratable acids content in the fruit was influenced by the combination of Tytanit+Optysil. The results of the experiment are one-year and the reduction in yield was influenced by weather conditions (spring frost), so we suggest that the experiment be repeated in more locations and in several growing seasons to obtain more accurate results of Tytanit and Optysil.
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