In the graduation thesis we wanted to find out whether spraying with Novagib (gibberellins) and Regalis Plus (prohexadione-calcium) after frost affects a bigger and high quality yield of apple (Malus domestica Borkh.) cultivar 'Golden Delicious'. The experiment was carried out in 2020 in an apple orchard in Šmarje near Šentjernej. Two treatments were included in the experiment: a control where the trees were not treated with Novagib and Regalis Plus, and a treatment where the trees were treated with Novagib and Regalis Plus after frost. The parameters of vegetative growth and generative development were measured in trees. It should be pointed out, however, that the percentage of I. quality class decreased, which was higher in control trees than in treated trees. The yield coefficient was higher in control trees. Treatment with Novagib and Regalis Plus had no effect on fruit height and width, soluble solids and titratable acid contents, but increased fruit firmness and starch content, indicating that the fruits were less mature compared to control fruits.
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