Utjecaj djelomične defolijacije na polifenolni sastav grožđa sorte 'Merlot' (Vitis vinifera L.)

Stojić, Igor

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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
Viticulture and Enology

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APA 6th Edition

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

MLA 8th Edition

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

Chicago 17th Edition

Harvard

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 15 January 2025, https://urn.nsk.hr/urn:nbn:hr:204:607436

Vancouver

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 2025 January 15] Available at: https://urn.nsk.hr/urn:nbn:hr:204:607436

IEEE

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

Cite this item: https://urn.nsk.hr/urn:nbn:hr:204:607436

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Title	Utjecaj 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.)
Author	Igor Stojić
Mentor	Marko Karoglan (mentor)
Committee member	Marko Karoglan (predsjednik povjerenstva)
Committee member	Bernard Kozina (član povjerenstva)
Committee member	Ana Jeromel (član povjerenstva)
Granter	University of Zagreb Faculty of Agriculture (Viticulture and Enology) Zagreb
Defense date and country	2018-07-11, 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)
Language	croatian
URN:NBN	urn:nbn:hr:204:607436
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
Terms of use
Repository	Repository Faculty of Agriculture University of Zagreb
Created on	2018-07-24 09:58:01