Terroir 2008 banner
IVES 9 IVES Conference Series 9 Influence of canopy management on yield, grape and wine quality. Relationship between the potassium content and pH in must and wine of the cultivar “Tempranillo”

Influence of canopy management on yield, grape and wine quality. Relationship between the potassium content and pH in must and wine of the cultivar “Tempranillo”

Abstract

In recent years red wines are being produced in Andalusia from indigenous and foreign grape varieties, one of which is the Spanish variety Tempranillo.
In young vineyards the vegetation/production ratio tends to be unbalanced, whereby the must obtained is not of high quality. To achieve a better vegetation/grape production ratio different ways of managing the canopy have been tested. The study has been carried out on Vitis Vinífera L. Cvs. Tempranillo in a vineyard in the province of Cadiz in southern Spain, a zone considered to have a warm climate.
Canopy management techniques used are as follows: pruning later, removal of bunch, training higher and more buds. Pruning later causes less vegetation, yield and a reduction in berry size. Removing the bunch induces more vegetation and increases berry size increasing the potassium content and pH. Higher training improves yield. The higher number of buds increases production and vegetative development.
These techniques improve aeration and photosynthetic activity. In the area in which the bunches are located, the temperature is higher and the percentage humidity is lower relative to the control.
Despite having succeeded in increasing total acidity of the must in some cases, the pH of same was not lowered as the high concentrations of potassium salify the acids and raise the pH.

DOI:

Publication date: December 8, 2021

Issue: Terroir 2008

Type : Article

Authors

Belén PUERTAS, Mª José SERRANO, Mª Jesús JIMÉNEZ, Emma CANTOS

IFAPA Centro Rancho de la Merced
Ctra. Trebujena, Km 3.2, 11471, Jerez de la Frontera, España
Consejería de Innovación, Ciencia y Empresa. Junta de Andalucía

Contact the author

Keywords

Canopy management, Yield, Potassium, pH, Tempranillo

Tags

IVES Conference Series | Terroir 2008

Citation

Related articles…

A fine scale study of temperature variability in the Saint-Emilion area (Bordeaux, France)

As the quality and typicity of wine are influenced by the climate, it is essential to have a good knowledge of climate variability, especially with regard to temperature, which has a great impact on vine behavior and grape ripening.

Monitoring small-scale alcoholic fermentations using a portable FTIR-ATR spectrometer and multivariate analysis

Although some wine production processes still rely on post-production evaluation and off-site laboratory analysis, the new winemaking industry is aware of a need for a better knowledge of the process to improve the properties of the final product. Thus, more and more wineries are interested in incorporating quality-by-design (QbD) strategies instead of postproduction testing because of the possibility to early detect deviations in fermentation or any other wine process. This would allow to detect unwanted situations and eventually to ‘readjust’ the process, thus minimizing rejects.

Spatial variability of temperature is linked to grape composition variability in the Saint-Emilion winegrowing area

Elevated temperature during the grape maturation period is a major threat for grape quality and thus wine quality. Therefore, characterizing the grape composition response to temperature at a larger scale would represent a crucial step towards adaptation to climate change. In response to changes in temperature, various physiological mechanisms regulate grape composition. Primary and secondary metabolisms are both involved in this response, with well-known effects, for example on anthocyanins, and lesser known effects, for example on aromas or aroma precursors. At the field scale or at the regional scale, however, numerous environmental or plant-specific factors intervene to make the effects of temperature difficult to distinguish from overall variability. In this study, it was attempted to overcome this difficulty by selecting well-characterized situations with differing temperatures.
A long-term study of air temperature variability across several Merlot vineyards in the Saint-Emilion and Pomerol wine producing area found significant temperature differences and gradients at various time scales linked to environmental factors. From this study area, a few sites were selected with similar age, soil and training system conditions, and with repeated and contrasted temperature differences during the maturation period. The average temperature difference during the maturation period was about 2°C between cooler and warmer sites, a difference similar to that expected under future climate change scenarios. In close vicinity to the temperature sensors at each site, grape berries were sampled at different times until full maturity during 2019 and 2020. Also, berries from bunches on either side of the row were analyzed separately, allowing an investigation of bunch exposure effect associated with the coupling of berry temperature and solar radiation. Four replicates of pooled berries for each time – site – bunch exposure combination were obtained and analyzed for biochemical composition. Analyses of variance of the biochemical composition data collected at different sampling times reveal significant effects associated with temperature, site, and bunch azimuth. For instance, anthocyanins in grape skins are clearly influenced by temperature and solar radiation exposure, with up to 30% reduction in warmer conditions.

High-altitude vineyards under extreme conditions in the PIWI context of cultivation: economic and marketing evidence from an exploratory study in Northern Italy

Viticulture has spread to unexpected locations, such as high-altitude terrain. Among these, high-altitude viticulture has captured considerable attention, not only for the uniqueness of its products and landscapes but also because it offers an effective response to climate changes
The aim of this study is to analyse and compare wineries that used Piwi varieties (acronym for the German Pilzwiderstandfähig, i.e., cryptogame-resistant) at high altitudes (between 500 and 920 m a.s.l.) with the traditional non-mountainous viticulture model.

Study of the vine performance and the wine composition of Tannat on the terroir of Colonia del Sacramento – Uruguay

Grape-growing terroirs were defined according to the method proposed by Falcetti and Asselin (1996) near of Colonia de Sacramento, a city of Uruguay situated on the left of the “Rio de la Plata”.