In the diploma thesis, we investigated whether treating grapevines with preparations derived from algae increases yield, growth and the quality of grapes. We treated the vines with two different products from the manufacturer Kimitec. The first product is AP-3 contains microalgae Scenedesmus spp., the second product is Seanergy, containing microalgae Spirulina and macroalgae Ascophyllum. The vines were treated four times during the growth period, and during this time, we conducted growth measurements, maintained a general observations journal, and prior to the onset of ripening, we sampled 100 leaves with petiole from each treatment, sending them to an accredited laboratory for analysis of total elemental content. The highest average final length was observed in shoots treated with the AP-3 product (265.1 cm), followed by the Seanergy preparation (261.9 cm), while the smallest shoots were in the control group (240.7 cm). Similarly, with the AP-3 preparation, we measured the highest chlorophyll content in the leaves expressed as Yara N-tester units (422.1), followed by the Seanergy preparation (418.5), and the control group with the lowest content (412.9). In terms of yield, the highest was measured in vines treated with the AP-3 (1.9 kg), followed by the Seanergy (1.75 kg), and the control group had the lowest yield (1.65 kg). The quality of the must was consistent across all treatments.
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