Utjecaj defolijacije i prorjeđivanja grozdova na kemijski sastav grožđa sorte 'Zlatarica vrgorska' u vinogorju Vrgorac

master's thesis

• Title (english): Influence of defoliation and thinning of grapes on the chemical composition of grapes of variety 'Zlatarica vrgorska' in Vrgorac vineyards
• Author: Katarina Kontrec
• Mentor: Željko Andabaka (mentor)
• Committee member: Željko Andabaka (predsjednik povjerenstva)
• Committee member: Marko Karoglan (član povjerenstva)
• Committee member: Zvjezdana Marković (član povjerenstva)
• Committee member: Iva Šikuten (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Viticulture and Enology); Zagreb
• Defense date and country: 2021-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

'Zlatarica vrgorska' je autohtona sorta koja se uzgaja na području vinogorja Vrgorca. Zbog svojeg jakog genereativnog potencijala sorta postaje osjetljiva na trulež. Provođenjem ampelotehničkih mjera djelomične defolijacije može se utjecati na smanjenje pritiska gljivičnih oboljenja na sortu. Ampelotehnički zahvat prorjeđivanja grozdova utječe na prinos sorte i na kvalitativni potencijal grožđa. Cilj istraživanja je utvrditi utjecaj rane defolijacije i prorjeđivanja grozdova na kemijski sastav grožđa i gospodarske karakteristike sorte 'Zlatarica vrgorska'. Istraživanje će se provesti u nasadu sorte 'Zlatarica vrgorska' u vinogorju Vrgorac. Pokus je postavljen slučajnim bloknim rasporedom s tri pokusne varijante. Prva varijanta predstavljala je bazalnu defolijaciju po završetku cvatnje, druga bazalnu defolijaciju po završetku cvatnje i prorjeđivanje grozdova dok je treća bila kontrola. Rezultati uvometrijskih i mehaničkih pokazatelja pokazali su kako zahvati utječu na smanjivanje mase grozda, ali povećanje broja bobica na jednom grozdu, dok se broj grozdova po trsu i ukupni prinos smanjuje. Kemijska analiza kvalitete mošta ukazala je na povećanje šećera u moštu, a smanjenje ukupnih kiselina. Analiza hlapivih spojeva je pokazala da defolijacija utječe na povećanje količine hlapljivih spojeva, a kombinacija defolijacije i prorjeđivanja smanjuje količine spojeva.

Abstract (english)

'Zlatarica vrgorska' is an autochthonous variety that is grown in the area of the Vrgorac vineyards. Due to its strong generative potential, the variety becomes susceptible to rot. The implementation of ampelotechnical measures of partial defoliation can reduce the pressure of fungal diseases on the variety. Ampelotechnical intervention of thinning of grapes affects the yield of the variety and the qualitative potential of grapes. The aim of the research is to determine the influence of early defoliation and thinning of grapes on the chemical composition of grapes and economic characteristics of the variety 'Zlatarica vrgorska'. The research will be carried out on the variety 'Zlatarica vrgorska' in the Vrgorac vineyards. The experiment was set up in a randomized block layout with three experimental variants. The first variant represented basal defoliation at the end of flowering, the second basal defoliation at the end of flowering and thinning of clusters while the third was control. The results of uvometric and mechanical indicators showed that the interventions affect the reduction of cluster mass, but increase the number of berries per cluster, while the number of clusters per vine and the total yield decreases. Chemical analysis of must quality indicated an increase in must sugar and a decrease in total acidity. Analysis of volatile compounds showed that defoliation increases the amount of volatile compounds, and the combination of defoliation and thinning reduces the amount of compounds.

• Keywords: 'Zlatarica vrgorska'; defolijacija; prorjeđivanje grozdova; rez u zeleno
• Keywords (english): 'Zlatarica vrgorska'; defoliation; thinning of grapes; prunning
• Language: croatian
• URN:NBN: urn:nbn:hr:204:934645
• Study programme: Title: Horticulture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka hortikulture (magistar/ magistra inženjer/inženjerka hortikulture)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-11-26 09:08:14