Utjecaj defolijacije na kemijski sastav grožđa sorte 'Plavac mali crni' u uvjetima vinogorja Hvar

master's thesis

• Title (english): Influence of defoliation on the chemical composition of grape variety 'Plavac mali crni' in the conditions of Hvar vineyard
• Author: Jure Sarjanović
• Mentor: Željko Andabaka (mentor)
• Committee member: Željko Andabaka (predsjednik povjerenstva)
• Committee member: Marko Karoglan (član povjerenstva)
• Committee member: Domagoj Stupić (član povjerenstva)
• Committee member: Iva Šikuten (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Viticulture and Enology); Zagreb
• Defense date and country: 2021-07-16, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Defolijacija vinove loze, kao zahvat zelenog reza, odavno je poznata u svim vinogradarskim regijama. Vinogradari sve više primjenjuju defolijaciju u svrhu smanjenja lisne mase u zoni grozdova. Sorta 'Plavac mali crni' autohtona je hrvatska sorta te je najznačajnija dalmatinska sorta. Pokus je postavljen početkom 2020. godine u vinogradima vinogorja Hvar. Pokus je postavljen je po slučajnom bloknom rasporedu s četiri pokusne varijante. U svakom vinogradu primjenjivala se defolijacija u tri različite faze. Rana defolijacija bazalnih listova, obavljena je tako da je uklanjano 4-5 bazalnih listova u zoni grozda. Defolijacija listova u zoni grozdova početkom šare, provedena je na način da je iznad bazalnih listova uklonjeno 4-5 listova oko grozdova, te defolijacija bazalnih listova početkom šare provedena je na način da je u zoni grozdova uklonjeno 4-5 bazalnih listova. Rezultati nakon provedenog pokusa pokazuju da je defolijacija bazalnih listova prije početka šare najviše utjecala na povećanje sadržaja šećera, dok je negativno utjecala na sadržaj ukupnih polifenolnih spojeva. Defolijacija bazalnih listova početkom šare različito je djelovala na južnoj i sjevernoj strani vinogorja Hvar. Na južnoj strani djelovala je pozitivno gotovo na sve parametre, dok je na sjevernoj strani primjena ove defolijacije dovela do smanjenja gotovo svih istraživanih parametara. Zadnja defolijacija koja je provodena je defolijacija listova u zoni grozdova, koja je rezultirala pozitivnim učinkom na sjevernoj i južnoj strani.

Abstract (english)

Vine defoliation, as a green cut procedure, has long been known in all wine–growing regions. Growers are increasingly appliying defoliation to reduce leaf mass in the cluster zone. The variety 'Plavac mali crni' is an autochthonous Croatian variety and is the most important Dalmatian variety. The experiment was set up in early 2020 in the vineyards of the Hvar growing region. It is set according to a radnom block layout. Defoliation was applied in three different phases in each vineyard. Early defoliation of basal leaves was performed by removing 4-5 basal leaves in the cluster zone. Defoliation of leaves in the cluster zone at the beginning of the verasion was performed by removing 4-5 leaves around the clusters, and defoliation of basal leaves at the beginning of the verasion was performed by removing 4-5 basal leaves in the cluster zone. The results showed that defoliation of basal leaves before the verasion had the greatest effect on the increase of sugar content, and negative effect on the content of total polyphenolic compounds. Defoliation of basal leaves at the beginning of the verasion had different effects on the south and north sides of Hvar vineyards. On the south side it had a positive effect on almost all parameters, while on the north side the application of defoliation led to a reduction of almost all parameters. The last defoliation performed was defoliation of leaves in the cluster zone, which had positive effect on both north and south side vineyards

• Keywords: Plavac mali crni; vinogorje Hvar; defolijacija
• Keywords (english): Plavac mali; vineyard Hvar; defoliation
• Language: croatian
• URN:NBN: urn:nbn:hr:204:016763
• 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: Access restricted to students and staff of home institution
• Created on: 2021-10-07 08:28:26