GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Influence of ‘pinotage’ defoliation on fruit and wine quality

Influence of ‘pinotage’ defoliation on fruit and wine quality

Abstract

Contex and purpose of this study – Among the different management techniques in Viticulture, which have been developed with the purpose of optimizing the interception of sunlight, the photosynthetic capacity of the plant and the microclimate of the clusters, especially in varieties that show excess vigor, the management of defoliation presents great importance. The defoliation consists of the removal of leaves that cover or that are in direct contact with the curls, which can cause physical damages in the berries, and aims to balance the relation between part area and number of fruits, providing the aeration and insolation in the interior of the vineyard, as well as reduce the incidence of rot in order to achieve greater efficiency in phytosanitary treatments and quality musts. The objective of this work was to evaluate the effect of defoliation on the physical-chemical parameters of grapes, musts and wine from the ‘Pinotage’ cultivated in Dom Pedrito, Region of “Campanha”, “RS”, Brazil, in a commercial vineyard planted in the East-West direction .

Material and methods – The study was carried out by the Nucleus of Study, Research and Extension in Enology (NEPE²), of the Bachelor’s Degree in Oenology of UNIPAMPA. The work was carried out in the 2017/18 harvest, with the grapes coming from a commercial vineyard cultivated in a simple vineyard, with a height of 1.0m of the first wire to the ground, 0.5m height of the leaf area, spacing of 1.3m between plants and 3.0m between rows, adding 84 plants. Defoliation was carried out in the color change of the berries, being divided into four treatments, each treatment with 21 plants, where T1 Control (no defoliation of the vine); Defoliation to the North; T3 Defoliation to the South and; T4 Defoil South and North. Microvinifications were done with temperature control and five days of maceration. It was evaluated in the must: total soluble solids, density (g L-1), pH, reducing sugars (g L-1), Gluconic Acid (g L-1) and Potassium Content (mg L-1); in the wine the following variables were evaluated: Alcohol (% v/v), Total Acidity (meq L-1), Density at 20ºC, pH, Volatile Acidity (meq L-1), Glycerol (g L-1), Tartaric Acid (g L-1), Malic Acid (g L-1), Color Intensity and Tint. The data were submitted to the Tukey averages comparison test at 5% probability.

Results – According to the results we can verify that the treatments with defoliation did not influence the quality of the grape must, but the defoliation in the North direction, did decrease the glycerol content of the wine.

Acknowledgments: We would like to thank “Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul” (“FAPERGS/Edital 01/2019 – Auxílio para Participação em Eventos – APE”) for the financial support for participation to the author Juan SAAVEDRA DEL AGUILA, in the 21st GIESCO International Meeting (Group of International Experts for Cooperation on Vitivinicultural Systems): 2019, Thessaloniki, Greece. We would like to thanks to the winegrower Mr. Adair Camponogara and the Citropack and Amazon Group.

Download the PDF

DOI:

Publication date: March 12, 2024

Issue: GiESCO 2019

Type: Poster

Authors

Marcelo de Souza SOARES1, Pedro Paulo PARISOTO1, Nádia Cristiane Alves VIANNA1, Bruna Laís HAMM1, Daniel Pazzini Eckhardt1, Lília Sichmann HEIFFIG-DEL AGUILA2, Juan SAAVEDRA DEL AGUILA1*

1 University Federal of Pampa (UNIPAMPA), Cep 96450-000, Dom Pedrito, RS, Brazil
2 Embrapa Temperate Agriculture, Pelotas, RS, Brazil

Contact the author

Keywords

Vitis vinifera L.,Carbohydrates, Photosynthesis, Viticulture.

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

The aroma diversity of italian white wines

AIM: Aroma is a key contributor to white wines sensory typicality, perceived diversity and overall preference.

Read More

Effect of irrigation in cover cropping vineyards

Cover cropping in vineyard is a sustainable and alternative soil management system to conventional tillage that is gaining more and more importance among winegrowers and is being promoted, among other organizations, by the European Union through the eco-schemes of the Common Agricultural Policy.
However, the use of cover crops in Mediterranean viticultural environments is conditioned, to a large extent, by the availability of irrigation water which, in a context of global warming like the one we are experiencing, must be adjusted to savings strategies, supplying to the vine only what it needs in each moment.

Read More

Nitrogen isotope ratio (δ15N) as a tool to trace the major nitrogen source in vineyards

Aim: to elucidate if it is possible to detect variations in the source of nitrogen (organic vs. inorganic) measuring nitrogen isotope ratio (δ15N) in berries and to examine the degree of variation occurring for this parameter naturally within a vineyard.

Read More

Comparison of aroma-related compounds of carbonic maceration and traditional young red winemaking in case of Merlot by means of targeted metabolomic approach

Winemaking decisions and techniques are known to affect the final aromatic composition of red wines. Winemakers put a constant effort into the improved controlling of vinification procedures to achieve better quality. Anyway an increased customer’s demand for uniqueness is often forcing them to adjust and offer new and new interesting products. To support the producers, an improved knowledge on aromatic potential as affected by classical and alternative strategies is needed.

Read More

Towards adaptation to climate change in Rioja: Quality evaluation of wines obtained from Grenache x Tempranillo selections

The wine sector is of great relevance and tradition in Mediterranean countries, however, it may be most susceptible to climate change. In recent years, wine production is facing changes worldwide, both at environmental as well as commercial levels, due to global warming and the shift in consumers’ preferences. Wine growers and wine makers are in search of solutions that allow to face these new challenges. One of the most promising initiatives in the long term is the introduction of new plant materials, specifically intraspecific hybridizations between premium varieties that may improve traditional germplasm in its adaptation to climate change. These inter-varietal crosses have the potential to generate quality wines, whilst maintaining the regional typicity, and constitute an attractive alternative for the consumer due to their sensory attributes. In this study, we have evaluated wines from 29 intraspecific Garnacha x Tempranillo hybrids in two different locations, with the aim to assess their oenological potential and sensory attributes. Thirteen of the selections were white and 16 were red. Microvinifications were conducted with two or three replications depending on grape availability. Conventional oenological parameters were determined for all wines. The sensory evaluation and hedonic scores were given by five experts. Red selections obtained higher quality scores than white ones. Among the white selections with higher quality scores, GT-41 Varea and GT-159 Varea outstand, due to their high total acidity and high malic acid content. Regarding red selections, GT-57 Varea and GT-57 UR were perceived as higher in quality, highlighted for their moderate alcoholic and high anthocyanin content. Our results indicate that intraspecific hybridization may be a powerful tool for adapting traditional cultivars to climate change in Rioja.

Read More