engleski

Influence of different leaf removal terms on some quality parameters of cv. Merlot and Blaufraenkisch (Vitis vinifera L.) in vinegrowing district Djakovo

The aim of this research was to identify the impact of different leaf removal terms on sugar content, total acidity and real acidity in must as well as total phenolics and anthocyanins in skin of Merlot and Blaufraenkisch (Vitis vinifera L.) grafted on rootstock SO4. The research was carried out during year 2015, located on Agriculture faculty Osijek experimental field in Mandićevac, east continental vinegrowing region, subregion Slavonia, vinegrowing district Djakovo. Vineyard was planted in 2013 with 2, 2x0, 8 m plant spacing. The experiment was set up according to random block design with three treatments in four replications (control treatment - without leaf removal, pre-bloom leaf removal - E-L stages 16-17 and pre-veraison leaf removal – E-L stage 34). There were no significant differences in sugar content between control and leaf removal treatments for both research cultivars. The highest sugar content was measured in Merlot in pre-veraison leaf removal treatment (107 ⁰Oe) and slightly lower in control treatment and pre-bloom leaf removal treatment (105 ⁰Oe). The highest total acidity was measured in must of Blaufraenkisch in treatment of pre-veraison leaf removal (7, 02 g/l) and there were no significant differences between treatments. On grounds of results there were no significant differences for total acidity in must of Merlot. There were no notably variation for real acidity.

leaf removal ; sugar content ; total acidity ; Merlot ; Blaufraenkisch

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