In master’s thesis, we investigated how the addition of a biostimulant Amalgerol Essence affects the yiled and characteristics of hydroponically grown basil (Ocimum basilicum L.), when the nutrient concentration in the nutrient solution is reduced. Two cultivars, a green-leaved cultivar 'Verdano' and the red-leaved cutivar 'Rosie'. We used two concentrations of the nutrient solution (70 % and 100 %) and two concentrations of the biostimulant Amalgerol Essence (0.1 % and 0.15 %). Measurements were taken on plants that were pruned after the second node had developed. We measured plant weight, dry matter content, the amount of photosynthetic pigments in the green-leaved basil variety, the amount of anthocyanins in the red-leaved basil variety, and total phenolic compounds. Only basil leaves were used to determine the content of individual compounds. The results of the experiment did not show the expected reduction in growth and yield at a 70% nutrient solution concentration compared to a 100 % concentration. For both culitvars, the addition of a biostimulant to a 70% nutrient solution did not increase yield; in green-leaved basil, the highest yield (10.6 kg/m²) was achieved without a biostimulant. Increasing the biostimulant dose did not improve yield either; its effect on individual quality parameters, such as photosynthetic pigments, phenolic compounds, anthocyanins, and nitrates, depended on the variety and sampling time. The results may have been influenced by technical issues involving partial clogging of the nozzles and the death of some red-leaved basil plants towards the end of the experiment. Under the conditions studied, neither reducing the nutrient solution concentration nor adding a biostimulant led to the expected increase in yield or quality.
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