Effects of Foliar Seaweed and Humic Acid Treatments on Monoterpene Profile and Biochemical Properties of cv. Riesling (V. vinifera L.) Throughout the Maturation Period
This study was conducted to research the effects of foliar treatments of seaweed (SW) and humic acid (HA) on cv. Riesling wine grape throughout ripening period from verasion period to harvest period at 15 day interval such as verasion period, 15 d after verasion period and 30 d after verasion period to examine biochemical variations in berry. In the research, it was utilized from doses of 0, 1000, 2000 ppm of SW and HA treatments and these doses were applied to grapevines three times at different phenological stages of grapevine. Among the berry sampling terms for measurement and analysis, the best quality characteristics were respectively obtained from terms of 30 d after verasion, 15 d after versaion and verasion and it was seen that foliar sprays of SW and HA could modify the biochemical characteristics of berries in cv. Riesling. In terms of free volatile terpenes (FVTs) and potentially volatile terpenes (PVTs) of berries, which are also very important for aromatic grape cultivars, 1000 ppm doses of both SW and HA treatments respectively displayed the highest contents in FVTs (0.880 and 0.804 mg L-1) and PVTs (2.153 and 2.084 mg L-1). As a result, 1000 ppm doses of SW and HA treatments led to the best improvements in most quality characteristics of berry when they were harvested at 30 d after verasion period.
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