Improvement of ampelotechnical measures of grapevine (Vitis vinifera L.) \u27Sauvignon blanc\u27 variety

Razlistanje je vinogradniška praksa, ki se izvaja za izboljšanje mikroklime listne stene trt, kar pozitivno vpliva na kakovost grozdja in vina. V lastnem vinogradu s sorto \u27Sauvignon\u27 smo leta 2014 opravili bločni poskus s tremi obravnavanji: kontrola brez razlistanja (K), razlistanje 1 – razlistanje v coni grozdja, ko so jagode velikosti graha (D1), in razlistanje 2 – razlistanje v coni nad grozdjem pred zorenjem (D2). S poskusom smo želeli ugotoviti, ali različni termini: (T1) 25. 8., (T2) 4. 9., (T3) 12. 9., (T4) 20. 9. 2014 in cone razlistanja vplivajo na količino in kakovost grozdja ter kasneje tudi vina sorte \u27Sauvignon\u27. Analiza grozdja v našem poskusu je pokazala, da ob trgatvi med obravnavanji v masi jagod ni bilo značilnih razlik. Razlistanji D1 in D2 sta različno vplivali na vsebnost topne suhe snovi (TSS) v jagodah. Razlike med obravnavanji so se pokazale pri zadnjih dveh terminih vzorčenja. V tretjem terminu vzorčenja sta obe razlistanji prinesli pričakovane rezultate oziroma povečanje vsebnosti TSS, a je zaradi padavin do trgatve prišlo do zmanjšanja vsebnosti TSS v jagodah. Razlistanje nad cono grozdja ni dalo pričakovanih rezultatov, saj je vsebnost TSS ostala enaka kot pri kontroli. V poskusu značilne razlike v vsebnosti titracijskih in skupnih kislin med obravnavanji niso zabeležene. Značilno povečanje vsebnosti analiziranih skupnih fenolnih snovi v jagodah sorte \u27Sauvignon\u27 se pokaže v drugem in tretjem terminu vzorčenja pri D1. V tretjemu terminu je razvidno, da ima ukrep D1 značilen vpliv na sintezo fenolnih snovi v kožici jagode sorte \u27Sauvignon\u27. Za boljše razumevanje vpliva razlistanja vinske trte na kakovost grozdja in vina bi bilo treba poskus ponoviti še kakšno leto.Defoliation is a viticultural practice carried out to improve the microclimate of the grapevine canopy, which has a positive impact on the quality of grapes and wine. In our own vineyard with the \u27Sauvignon Blanc’, we performed a block experiment in 2014 with three treatments: control without defoliation (K), defoliation 1 – defoliation in the grape zone when the berries are pea-sized (D1), and defoliation 2 – defoliation in the zone above the grapes before ripening (D2). With the study, we would like to find out whether different timing: (T1) 25. 8., (T2) 4. 9., (T3) 12. 9., (T4) 20. 9. 2014 and zones of defoliation affect the quantity and quality of grapes and wines sauvignon. The analysis of the grapes showed no significant differences in berries weight at harvest. D1 and D2 had different impact on the soluble dry matter content (SDMC) in the berriesdifferences among treatments have been shown in the last two sampling periods. In the third sampling, both defoliations have brought the expected results, an increase in SDMC. But due to precipitation before harvest, there was a berry decrease in SDMC. D2 did not give the expected results, as the SDMC remained the same as in the control. No significant differences in titratable and total acid content were recognized among treatments in the experiment. A significant increase in total analysed phenolic contents is shown in the second and third sampling period at D1. At third sampling, D1 has a significant impact on the synthesis of phenolic substances in the skin of the variety \u27Sauvignon\u27. To better understand the impact of vine defoliation on the quality of grapes and wine, the experiment would need to be repeated for another year