In intensive apple orchards, thinning is one of the key technological measures. The purpose of the master thesis was to determine the effect of thinning on fruit quality of cultivar 'Pinova'. The experiment was performed at the Horticultural Center of the Biotechnical Faculty in Orehovlje. Two treatments were included in the experiment: control and chemical thinning with Exilis (6-benzyladenine - BA) at a dose of 8 l/ha, which was carried out on 7th May 2021. Chemical thinning of the variety 'Pinova' was not successful because the number of fruit/tree was equal to the number of fruit/tree in the control. We believe that poor weather conditions after chemical thinning affected the poor thinning efficiency. In the experiment, we counted the number of fruit/tree, weighed the yield/tree and classified it into 1st and 2nd quality class. Fruit dimensions, fruit weight, fruit firmness, soluble solids content were measured, starch was determined according to the starch scale, and the parameters of ground and cover colour were measured. We found that there were no statistically significant differences between control and treatment, where the trees were chemically thinned, in all measured parameters. Such experimental results are due to low temperatures in May (average 15 °C), drought and high temperatures in June, July and August, and inaccessible irrigation water, which greatly affected fruit quantity and quality.
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