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master's thesis
Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)
Zagreb: University of Zagreb, Faculty of Agriculture, 2018. urn:nbn:hr:204:607436
Stojić, Igor
University of Zagreb
Faculty of Agriculture
Department of Viticulture and Enology

Institutional repository: Repository Faculty of Agriculture University of Zagreb

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Stojić, I. (2018). Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.) (Master's thesis). Zagreb: University of Zagreb, Faculty of Agriculture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:204:607436

Stojić, Igor. "Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)." Master's thesis, University of Zagreb, Faculty of Agriculture, 2018. https://urn.nsk.hr/urn:nbn:hr:204:607436

Stojić, Igor. "Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)." Master's thesis, University of Zagreb, Faculty of Agriculture, 2018. https://urn.nsk.hr/urn:nbn:hr:204:607436

Stojić, I. (2018). 'Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)', Master's thesis, University of Zagreb, Faculty of Agriculture, accessed 02 September 2024, https://urn.nsk.hr/urn:nbn:hr:204:607436

Stojić I. Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.) [Master's thesis]. Zagreb: University of Zagreb, Faculty of Agriculture; 2018 [cited 2024 September 02] Available at: https://urn.nsk.hr/urn:nbn:hr:204:607436

I. Stojić, "Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)", Master's thesis, University of Zagreb, Faculty of Agriculture, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:204:607436

Metadata
TitleUtjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)
Title (english)The effect of partial defoliation on polyphenol composition of Merlot grapes (Vitis vinifera L.)
AuthorIgor Stojić
MentorMarko Karoglan (mentor)
Committee memberMarko Karoglan (predsjednik povjerenstva)
Committee memberBernard Kozina (član povjerenstva)
Committee memberAna Jeromel (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Agriculture
(Department of Viticulture and Enology)
Zagreb
Defense date and country2018-07-11, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Agronomy
Abstract
Agrotehnički i ampelotehnički zahvati mogu značajno utjecati na kvalitativni sastav grožđa, a na kraju i vina. Jedan od najčešćih ampelotehničkih zahvata zelenog reza je djelomična defolijacija. U ovome radu istražen je utjecaj djelomične defolijacije na prinos i kemijski sastav grožđa sorte Merlot, 2017. godine. Istraživanje je bazirano na rezultatima dobivenim nakon provedene djelomične defolijacije četiri bazalna lista sa svake mladice pokusnih trsova u četiri različita termina; prije oplodnje i cvatnje (DI), neposredno nakon oplodnje i cvatnje (DII), u fazi zatvaranja grozdova (DIII) i u vrijeme šare (DIV). U sve četiri varijante zabilježena je redukcija prinosa u odnosu na kontrolni (K) tretman u kojem nije bila provedena defolijacija. Suprotno očekivanom, nakon provedene djelomične defolijacije nije došlo do povećanja koncentracije šećera u grožđu, dok je djelomična defolijacija u terminu prije oplodnje i cvatnje (DI) rezultirala sniženom koncentracijom šećera u grožđu. Utvrđen je porast koncentracije ukupne kiselosti i pad pH u tretmanu djelomične defolijacije neposredno nakon oplodnje i cvatnje (DII), dok je u ostalim terminima defolijacije (DI, DIII i DIV) utvrđen pad ukupne kiselosti i porast pH. Koncentracija ukupnih polifenola u svim terminima djelomične defolijacije bila je signifikantno viša u usporedbi s kontrolnom varijantom (K).
Abstract (english)
It is well known that agrotehnical and ampelotechnical procedures have great impact to oenological quality of grape and wine. Partial defoliation is one of the most commonly used ampelotechnical procedure in canopy manipulation. The aim of this study was to evaluate the influence of partial defoliation on the yield and chemical composition of grapes Merlot in 2017. This research is based on the results obtained after partial defoliation of four basal leaves from each shoot of experimental vines carried out in four different stages; before fertilization and flowering (DI), immediately after fertilization and flowering (DII), in the faze of berry set (DIII) and in the period of veraison (DIV). In all four stages there was a reduction of yield compared to control (K), treatment where no defoliation was performed. On the contrary to the expected, there was no increase in sugar concentration in grapes after partial defoliation, while defoliation in the stage before fertilization and flowering (DI) resulted in reduced grain soluble solids concentration. Partial defoliation conducted immediately after fertilization and flowering (DII) was found an increase in total acidity and pH decrease, while in other defoliation periods (DI, DIII and DIV) there was a decrease in total acidity and pH increase. Concentration of polyphenols of partial defoliation was significantly higher compared to control (K).
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:204:607436
Study programmeTitle: Horticulture
Study programme type: university
Study level: graduate
Academic / professional title: magistar/ magistra inženjer/inženjerka hortikulture (magistar/ magistra inženjer/inženjerka hortikulture)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2018-07-24 09:58:01