engleski

Influence of rootstock, bud number and harvest time on macro and micro elements of Malvasia istriana wine

Malvasia istriana (Vitis vinifera L.) the most important autochtonous grape cultivar grown in Croatia viticulture sub-region od Istria, has a great potential to produce high-quality white wines. The objective of this work was to study the influence of rootstock, bud number and harvest time on the content of macro and micro elements of Malvasia istriana wine. This study was performed on eight wines produced from Malvasai istriana grafted on two rootstocks (Kober 5BB, 420A) with different bud number (20, 30, 40 buds per vine) and different harvest time (early, normal, late stage of maturity). The measurents were performed with a seequential inductively coupled plasma-optical emission spectrometer, Optima 2000. In all treatments content of arsenic and cadmium were below limit detection indicating quite ecological vineyard management. Rootstock Kober 5BB showed the best results of K, Al, Fe, Zn and MN accumulation at late harvest, indicating K as potential indicator of harvest time. The same tendency was obtained in case of highest bud number (40) at late harvest. Rootstock 420A did not significantly influence the accumulation of elements in different harvest time and bud number, putting that way Kober 5BB as a dominant rootstock. In regard to Al, Fe, Zn and Mn content, Malvasia wines presents good additional source of these essential trace elemnts in diet.

Malvasia istriana; macro and micro elements; ICP-OES

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