GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Influence of trellis system and shoot density in yield and grape composition of a vineyard of Cabernet Sauvignon, in warm climate

Influence of trellis system and shoot density in yield and grape composition of a vineyard of Cabernet Sauvignon, in warm climate

Abstract

Context and purpose of the study – In vineyards grown in warm areas, it is usual that the stage of maturity of the grapes is fast and easily reach a high concentration of sugar and low acidity, but not a adequate phenolic maturation. The geometry of the trellis system and the shoot density can modify the microclimate of the cluster and, therefore, the maturation process.

Material and methods – In order to know whether, in warm areas, free or semi-free foliage systems are most appropriate to achieve a maturity more balanced than systems with guided foliage, such as the vertical shoot positioned, during 2013 and 2014 developed a test in a vineyard of Cabernet Sauvignon in Albacete (Spain). Comparing two trellis systems – vertical shoot positioned and sprawl -, each of them with three shoot densities – 35000, 55000 and 70000 shoots per hectare-. During maturation were determined the weight of the grape and the basic composition of the must (° Brix, pH and total acidity). Yield components and the grape phenolic components were determined at harvest.

Results – In both trellis systems the increased of crop load generated a proporcional increase in yield respect number of shoot, in addition to a delay in maturation, with lower concentrations of sugar and total phenols, and higher acidity. The vineyard in sprawl reached, usually, higher concentrations of sugar, but with equal or lower levels of acidity on vertical shoot positioned, which means a better sugar/acidity balance. The effect of the trellis system on the grape phenolic components was not consistent for the two years of study.

Download the PDF

DOI:

Publication date: September 27, 2023

Issue: GiESCO 2019

Type: Poster

Authors

Emilio PEIRO1,2*, Pedro JUNQUERA1,2, José Ramón LISSARRAGUE1,2

1 Grupo de Investigación en Viticultura. E.T.S.I.A.A.B. Universidad Politécnica de Madrid. C/ Senda del Rey s/n, 28040. Madrid, Spain
2 Gestión Integral de Viticultura (GIVITI), C/ Alcántara nº 46, bajo drcha, 28006, Madrid, Spain

Contact the author

Keywords

trellis systems, shoot density, yield, berry composition

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

Atmospheric modeling: a tool to identify locations best suited for vine cultivation. Preliminary results in the Stellenbosch region

The choice of sites for viticulture depends on natural environmental factors, particularly climate, as grapevines have specific climatic requirements for optimum physiological performance and berry quality achievement. In the Stellenbosch wine-producing region, the complex topography and the proximity of the ocean create a variety of topoclimates resulting in different growth conditions for vines within short distances.

Read More

Foamability of bentonite treated wines: impact of new acacia gum fractions obtained by ionic exchange chromatography (IEC)

Copper (Cu) is known to substantially impact wine stability through oxidative, reductive or colloidal phenomena. Recent work has shown that Cu exists predominantly in a sulfide-bound form, which may act as a potential source of sulfidic off-odours in wine and hence contribute to reductive flavours

Read More

Vineyard nutrient budget and sampling protocols

Vineyard nutrient management is crucial for reaching production-specific quality standards, yet timely evaluation of nutrient status remains challenging. The existing sampling protocol of collecting vine tissue (leaves and/or petioles) at bloom or veraison is time-consuming. Additionally, this sampling practice is too late for in-season fertilizer applications (e.g. N is applied well before bloom). Therefore alternative early-season protocols are necessary to predict the vine nutrient demand for the upcoming season. The main goals of this project are to 1) optimize existing tissue sampling protocols; 2) determine the amount of nutrients removed at the end of the growing season.

Read More

Reusable system for wine bottles: An analysis of acceptance among German wine consumers

Consumer demands for environmentally friendly products, including wine, are constantly increasing.

Read More

PHOTOCHEMICAL DEGRADATION OF TRYPTOPHAN IN MODEL WINE: IMPACT OF HEAVY METALS AND OXYGEN ON 2-AMINOACETOPHENONE FORMATION

The wine industry worldwide faces more and more challenges due to climate change, such as increased dryness in some areas, water stress, sunburn and early harvesting during hot summer temperatures¹. One of the resulting problems for the wine quality might be a higher prevalence of the untypical aging off-flavor (ATA)². A substance, which Rapp and Versini made responsible for ATA, is the 2-aminoace-tophenone (2-AAP)³. 2-AAP in wine causes a naphthalene, wet towels, wet wool, acacia flower or just a soapy note⁴.

Read More