Utjecaj djelomične defolijacije na mehanički i kemijski sastav grožđa sorte 'Cabernet sauvignon' (Vitis vinifera L.)

master's thesis

• Title (english): Effect of partial defoliation on mechanical and chemical composition of grape variety 'Cabernet sauvignon' (Vitis vinifera L.)
• Author: Kristina Tomić
• Mentor: Marko Karoglan (mentor)
• Committee member: Marko Karoglan (predsjednik povjerenstva)
• Committee member: Bernard Kozina (član povjerenstva)
• Committee member: Ana Marija Jagatić Korenika (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Viticulture and Enology); Zagreb
• Defense date and country: 2019-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

U suvremenom vinogradarstvu djelomična defolijacija redovito se primjenjuje s ciljem povećanja kvalitete grožđa. Cilj ovog istraživanja bio je utvrditi na koji način djelomična defolijacija utječe na mehanički i kemijski sastav grožđa sorte Cabernet sauvignon (Vitis vinifera L.), berbe 2016. Pokus je proveden na Vinogradarsko – vinarskom pokušalištu Jazbina na način da su četiri bazalna lista sa svake mladice uklonjena u četiri različita termina (prije cvatnje i oplodnje, neposredno nakon cvatnje i oplodnje, u fazi zatvaranja grozdova i u šari). Statističkom analizom dobivenih podataka utvrđeno je kako je djelomična defolijacija provedena u fazi zatvaranja grozdova najviše utjecala na smanjenje ukupne kiselosti te na povećanje vrijednosti pH i sadržaja šećera. Ista varijanta jedina je utjecala na smanjenje prinosa po trsu, dok kod ostalih varijanti nije bilo značajnih razlika. Varijanta defolijacije u fazi šare jedina je utjecala na povećanje ukupne kiselosti, a najviše na smanjenje sadržaja ukupnih polifenola. Djelomična defolijacija nije utjecala na prosječnu masu grozda i broj bobica.

Abstract (english)

In modern viticulture partial defoliation is regularly used to increase grape quality. The aim of this study was to determine in what way does partial defoliation affect the mechanical and chemical composition of grape variety Cabernet sauvignon (Vitis vinifera L.), 2016 harvest. The experiment was carried out at the Jazbina Experimental Station by removing four basal leaves from every vine in four different periods (before flowering and fertilization, after flowering and fertilization, in the pea size of the berry and at the veraison). Statistical analysis of the obtained data showed that partial defoliation carried out in the pea size of the berry most affected the reduction of total acidity and increase in pH and sugar content. The same treatment was the only one that influenced the decrease in yield per pound, while in the other variants there were no significant differences. The variation of the defoliation at the veraison was the only one that had the effect on the increase of total acidity, and most on the reduction of the total polyphenol content. Partial defoliation did not affect the average cluster mass and the number of berries.

• Keywords: djelomična defolijacija; Cabernet sauvignon; ukupna kiselost; mehanički sastav; polifenoli
• Keywords (english): partial defoliation; Cabernet sauvignon; sugar; total acidity; mehanical composition; polyphenols
• Language: croatian
• URN:NBN: urn:nbn:hr:204:828994
• 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: 2019-07-10 09:20:23