Apple (Malus × domestica Borkh.) is a fruit species that blooms in late April and in the beginning of May, but this time, due to the warm springs, is moving more and more towards the beginning of April. Later, however, frost occurs, due to which it can take the whole crop. Therefore, we have the ability to use plant strengthening agents. In 2019, at the Horticultural Centre of the Biotechnical Faculty, University of Ljubljana, on the apple variety 'Opal', we analysed the effect of Phylgreen (seaweed extract Ascophyllum nodosum) and Novagib (gibberellins) on yield and quality of apple fruit. We measured growth of selected fruit. At technological maturity, we harvested all the fruit, placed them in quality classes, counted and weighed them. In the laboratory, we measured the height, width and weight of the selected fruits. From each treatment we selected 20 fruit on which we performed maturity tests (weight, colour, flesh firmness, soluble solids, starch test) and by High-performance liquid chromatography (HPLC) the content of individual and total sugars and organic acids, and the spectrophotometric content of total phenols. After storage, the analyses were repeated and the results compared.
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