Vpliv odstranjevanja listov in uporabe mrež za zaščito pred ptiči na količino pridelka ter kakovostne parametre grozdja in vina sorte Sauvignonasse (Vitis vinifera L.)

diplomsko delo

Aljaž Namar (Author), Melita Sternad Lemut (Mentor), Paolo Sivilotti (Mentor)

Abstract

Odstranjevanje listov v območju grozdov in uporaba mrež za zaščito pred ptiči sta pogosto uporabljeni vinogradniški strategiji, ki vplivata na mikroklimatske pogoje v grmu vinske trte ter posledično na količinske in kakovostne parametre pridelka. V okviru diplomskega dela smo v vinogradu sorte 'Sauvignonasse' v Pristavem (Brda), po načelu naključne razporeditve blokov trt, zastavili primerjavo med petimi ukrepi: UNT (brez tretiranja), ELR (razlistanje pred cvetenjem), LLR (razlistanje po cvetenju), REN (razlistanje po cvetenju in senčenje z rdečimi mrežami) ter BKN (razlistanje po cvetenju in senčenje s črnimi mrežami). Tekom dozorevanja smo v odvisnosti od ukrepa spremljali osnovne kakovostne, ob trgatvi pa tudi količinske parametre pridelka. Grozdje smo ločeno vinificirali in v vinih določili osnovne kakovostne parametre, vsebnost hlapnih tiolov ter opravili senzorično analizo. Z obravnavanimi ukrepi smo le v manjši meri vplivali na kakovostne parametre grozdja, medtem, ko smo, predvsem z ukrepom ELR, pomembneje vplivali na količino pridelka in težo grozdov. V vinih smo (v korist obravnavanjem ELR, LLR in REN) opazili razlike v koncentracijah sladkorja prostega ekstrakta, poleg različnih trendov vsebnosti skupnih titracijskih kislin pa smo z ukrepi povzročili tudi nekaj razlik v vsebnostih posameznih kislin (vinska, jabolčna) ter skupnih hlapnih kislin. V primerjavi s kontrolo smo opazili povečanje vsebnosti 4MMP pri obravnavnjih BKN in ELR ter povečanje 3MH pri LLR, BKN in REN. Natančnejši pregled povzročenih sprememb in rezultatov (enoletnih) primerjav je nakazal, da učinki na opazovane parametre niso tako preprosti in linearni, da bi omogočili sistematično optimizacijo oz. da so medsebojni vplivi različnih kombinacij vinogradniških strategij na parametre grozdja kompleksni ter jih moramo uvajati nadvse previdno.

Keywords

diplomske naloge;Vitis vinifera L.;odstranjevanje listov;mikroklima;mreže za zaščito pred ptiči;osnovni količinski parametri;osnovni kakovostni parametri;hlapni tioli;

Data

Language:	Slovenian
Year of publishing:	2018
Typology:	2.11 - Undergraduate Thesis
Organization:	UNG VŠVV - College of Viticulture and Enology
Publisher:	[A. Namar]
UDC:	634.8+663.2
COBISS:	5122811
Views:	5047
Downloads:	207
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	EFFECT OF LEAF REMOVAL AND BIRD-NETTING ON YIELD PARAMETERS AND GRAPE AND WINE QUALITY OF SAUVIGNONASSE ( Vitis vinifera L.)
Secondary abstract:	Cluster area leaf removal and the use of nets for protection against birds are widely used viticulture strategies that can influence canopy microclimate and consequently the crop quantitative and qualitative parameters. In our work, we set up a completely randomised experiment in the vineyard of ‘Sauvignonasse’ in Pristava (Goriška Brda) with the aim to compare five different strategies: UNT (without treatment), ELR (leaf removal before flowering), LLR (leaf removal after flowering), REN (leaf removal after flowering and shading with red nets) and BKN (leaf removal after flowering and shading with black nets). During the ripening period the grapes basic quality parameters of all the treatments were monitored, whereas at harvest also the crop quantity parameters were calculated. The grapes were separately vinificated and the basic wine qualitative parameters as well as the content of volatile thiols were analysed in addition to sensory evaluation of the experimental wines. The observed strategies affected the grape quality parameters only to a lesser extend, whereas, with ELR mainly, we considerably influenced yield and cluster weight. In wines (in favour of ELR, LLR and REN treatments) differences in sugar free extract were observed. In addition to different trends in total titratable acidity, the treatments caused also some differences in the content of individual acids (tartaric, malic) and total volatile acids. Compared to control, an increase in 4MMP content was observed in BKN and ELR and an increase of 3MH in LLR, BKN and REN treatments. A more detailed overview of the changes and results of (one year) comparisons indicated that the effects on the observed parameters are not as simple and linear as to allow the systematic optimization and the effect of interactions of different strategies (their combinations) on grape parameters are complex and must be introduced with great caution.
Secondary keywords:	'Sauvignonasse' (Vitis vinifera L.);leaf removal;birds protection nets;microclimate;basic quantity and quality parameters of grapes and wines;volatile thiols.;
URN:	URN:SI:UNG
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Novi Gorici, Visoka šola za vinogradništvo in vinarstvo
Pages:	XII, 36 str.
ID:	10906180