The aim of this graduation thesis was to determine the effect of the biostimulant Amalgerol Essence on the growth and development of blueberry (Vaccinium corymbosum L.) cultivar 'Blueray'. The experiment began on 5th May 2020, when we planted three years old plants of the cultivar 'Blueray'. After planting, we measured the height of the bush and the total length of all shoots on 30th May and treated half of the plants with the biostimulant Amalgerol Essence for the first time. The other half of the plants were not treated. Thereafter, measurements were taken once a week. On 24th June, we harvested the first fruits, counted the number and weighed the weight of the fruits. We carried out 8 harvests. In 2021, we continued to measure the height and total length of the shoots and harvested fruits 6-times. During the experiment, we found that the biostimulant Amalgerol Essence affected the height of the plants. The increase in the total length of the shoots was higher in the plants treated with Amalgerol Essence. The biostimulant Amalgerol Essence influenced the yield only quantitatively, but not qualitatively. We see more blueberries on the treated plants, but they were smaller, while the fruit on the untreated plants were larger.
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