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Mechanické vlastnosti bobulí vybraných odrůd révy vinné jako faktor ovlivňující jejich jakost
Hvězdová, Kristýna
In the dissertation there have been done the determining of the mechanical properties of selected species in grapevine with respect to quality of grapes during ripening during four weeks. Determination was done by the TIRATEST 27 025 machine. Fixity skin of grapes was measurement on compress and penetration testing. Next determination was measurement of testing rip off stalk from grapes, weight, height and width of grape, also were measured sugar contents and titratable acids. For assessment were chosen this selected species: Rulandské šedé, Rulandské bílé, Sauvignon, Frankovka, Modrý Portugal and Cabernet Moravia. The results from compression test pressure on stalk were between 3,65 N (Sauvignon, on 3. gathering) − 20,92 N (Frankovka, on 2. gathering), in horizontal pressure 2,24 N (Sauvignon, on 2. gathering) – 9,6 N (Frankovka, on 3. gathering). The results of penetration test were between 0,54 N (Sauvignon, on 2. gathering) – 1,82 N (Frankovka, on 3. gathering) and the results from teasing stalk from grape test were between 1,02 N (Rulandské bílé, on 1. gathering) – 3,24 N (Frankovka, 4. gathering). There were found statistically important differences between all results between vine species and periods gathering.
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