The objective of the master's thesis was to determine whether the preparations Amalgerol Essence (algae), Delfan Plus (amino acids), and Novagib (gibberellins) affect the yield of the apple cultivar (Malus domestica Borkh.) 'Idared' at low temperatures in spring. The trial took place in two apple orchards in Zagaj (Bistrica ob Sotli) in 2021. The experiment included two treatments: a control treatment and a treatment in which we used preparations against frost. In the treatment with antifreeze preparations, the trees were sprayed with Amalgerol Essence (3 l/ha) on April 1 and 5, with Amalgerol Essence (3 l/ha), Delfan Plus (1.5 l/ha) and Novagib (0.5 l/ha) on April 9 and 16, and with Amalgerol Essence (3 l/ha) and Delfan Plus (1.5 l/ha) on April 23. The parameters of vegetative growth and generative development were measured for the trees included in the experiment. The preparations used had a positive effect on the number of fruits in the first quality class and on the size of the fruits, which became larger and heavier. The total number of fruits per tree, yield per tree and yield coefficient were higher compared to the control trees. The preparations also affected fruit coloration. The result was a higher yield per hectare and a higher percentage of yield in the first quality class. The preparations had no effect on fruit firmness, number of seeds, soluble solids content, and titratable acids content.
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