e-journal
Hydroxycinnamic acids as affected by different fertilization of Rebula grapevines
The phenolic composition of white grapes is important since browning reactions may dramatically
compromise the overall quality of musts and wines. Only few scientific contributions are
available, which investigated how fertilization can influence this class of compounds. Thus, the
aim of this work was to examine the effects of NPK soil fertilization coupled with soil or foliar applications
of Mg, Fe, and Zn on the concentrations of K, Mg, Fe, and Zn of grape berries and leaf
petioles of potted Rebula grapevines (Vitis vinifera L.), also revealing the change of hydroxycinnamic
acids in grape juice. The results obtained over the three-year study (2009–2011) showed
that NPK fertilization positively affected K and Zn concentrations of petioles and grape berries,
and negatively Mg. In addition, K (synergistic) and Mg (antagonistic) had an influence on Zn uptake.
Our findings suggest that the supply of NPK was profitable for a reduction of trans-caftaric
acid in grape juice, while only few differences were observed with further application of nutrients.
Key words: calcareous soil / foliar fertilization / phenols / Vitis vinifera
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