agronomy Article The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.) Dušica Cirkovi´c´ 1, Saša Matijaševi´c 2, Nebojša Deleti´c 3 , Bratislav Cirkovi´c´ 3, Uroš Gaši´c 4,* , Milica Sredojevi´c 5 , Zoran Jovanovi´c 3, Vladan Djuri´c 3 and Živoslav Teši´c 6 1 College of Agriculture and Food Technology, Cirila´ i Metodija 1, 18400 Prokuplje, Serbia;
[email protected] 2 Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia;
[email protected] 3 Faculty of Agriculture, University of Priština–Kosovska Mitrovica, Kopaoniˇckabb, 38219 Lešak, Serbia;
[email protected] (N.D.);
[email protected] (B.C.);´
[email protected] (Z.J.);
[email protected] (V.D.) 4 Institute for Biological Research “Siniša Stankovi´c”,University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia 5 Innovation Center of the Faculty of Chemistry, P.O. Box 51, 11158 Belgrade, Serbia;
[email protected] 6 University of Belgrade–Faculty of Chemistry, P.O. Box 51, 11158 Belgrade, Serbia;
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[email protected]; Tel.: +381-1-1207-8385 Received: 23 October 2019; Accepted: 28 November 2019; Published: 30 November 2019 Abstract: The influence of leaf area and various variants of manual defoliation on the phenolic profile of the Prokupac variety grape berry were investigated in the agroecological conditions of southern Serbia. The following four trial variants of manual defoliation were assessed: Early defoliation—variant I (flowering stage, 50% open flowers); early defoliation—variant II (grape size 3–5 mm); late defoliation—variant III (onset of grape ripening, veraison); and control (no defoliation).