Terroir 1996 banner
IVES 9 IVES Conference Series 9 The effect of soil and climate on the character of Sauvignon blanc wine

The effect of soil and climate on the character of Sauvignon blanc wine

Abstract

[English version below]

Un projet multidisciplinaire sur l’effet du sol et du climat sur la qualité du vin a débuté en Afrique du Sud il y a 5 ans. Des mesures sont effectuées sous culture sèche dans des vignes de Sauvignon Blanc dans six localités différentes, cinq dans le district de Stellenbosch et une à Durbanville. Au moins deux types de sol différents sont présents dans chaque localité. Les températures maximales moyennes en été varient de 28°C pour la localité la plus chaude à 25°C pour la plus froide. En général, les vins issus des localités les plus froides enregistrent des résultats les plus élevés pour l’intensité et la qualité des arômes. Quelques fois des vins issus de localités plus chaudes enregistrent cependant des résultats meilleurs que prévus. Ceci est attribué à des pratiques adéquates de préparation des sols qui résultent dans une bonne distribution des racines et une bonne gestion de la ramure.L’état hydrique des sols à la même localité montre des différences majeures malgré des sites d’expérimentation souvent éloignés de moins de 50 m l’un de l’autre. Ceci résulte dans de forts stress hydriques pour les vignes situées sur des sols qui ont une faible capacité hydrique. Les profils aromatiques des vins issus de différents sols à la même localité montrent aussi par conséquent des différences majeures. Les résultats mettent en évidence l’harmonie entre la nature de la texture/régime hydrique du sol et le climat de la saison. Une performance suSpérieure au cours d’une saison n’est pas nécessairement répétée la saison suivante.

Substantial climatic differences occur between localities in the districts of Stellenbosch and Durbanville.
In general, wines from coolest localities score the highest for intensity and quality of aroma.
In some cases wines from warmer localities score better than expected (adequate soil preparation, good canopy management).
Wine from soils at the same locality show major differences.
During dry summers wines from soils with higher water supplying capacities show highest aroma intensity, while the situation may be reversed during milder summers.
Harmony exists between the textural nature/water regime of a soil and climate experienced during a specific season.

DOI:

Publication date: March 2, 2022

Issue: Terroir 1998

Type: Article

Authors

KOBUS CONRADIE

ARC Fruit, Vine and Wine Research lnstitute, Nietvoorbij Centre for Vine and Wine. Private Bag X5026, 7599 Stellenbosch, South Africa

Tags

IVES Conference Series | Terroir 1998

Citation

Related articles…

Climate ethnography and wine environmental futures

Globalisation and climate change have radically transformed world wine production upsetting the established order of wine ecologies. Ecological risks and the future of traditional agricultural systems are widely debated in anthropology, but very little is understood of the particular challenges posed by climate change to viticulture which is seen by many as the canary in the coalmine of global agriculture. Moreover, wine as a globalised embedded commodity provides a particularly telling example for the study of climate change having already attracted early scientific attention. Studies of climate change in viticulture have focused primarily on the production of systematic models of adaptation and vulnerability, while the human and cultural factors, which are key to adaptation and sustainable futures, are largely missing. Climate experts have been unanimous in recognising the urgent need for a better understanding of the complex dynamics that shape how climate change is experienced and responded to by human systems. Yet this call has not yet been addressed. Climate ethnography, coined by the anthropologist Susan Crate (2011), aims to bridge this growing disjuncture between climate science and everyday life through the exploration of the social meaning of climate change. It seeks to investigate the confrontation of its social salience in different locations and under different environmental guises (Goodman 2018: 340). By understanding how wine producers make sense of the world (and the environment) and act in it, it proposes to focus on the co-production of interdisciplinary knowledge by identifying and foreshadowing problems (Goodman 2018: 342; Goodman & Marshall 2018). It seeks to offer an original, transformative and contrasted perspective to climate change scenarios by investigating human agency -individual or collective- in all its social, political and cultural diversity. An anthropological approach founded on detailed ethnographies of wine production is ideally placed to address economic, social and cultural disruptions caused by the emergence of these new environmental challenges. Indeed, the community of experts in environmental change have recently called for research that will encompass the human dimension and for more broad-based, integrated through interdisciplinarity, useful knowledge (Castree & al 2014). My paper seeks to engage with climate ethnography and discuss what it brings to the study of wine environmental futures while exploring the limitations of the anthropological environmental approach.

Influence of the agronomic management on the aroma of Riesling wines

Nitrogen fertilisation of grapevines is known to influence not only plant development and production yield, but also yeast assimilable nitrogen (YAN). This parameter is related to the growth of yeast

Olfactometry approach to assess odorant compounds of grape spirits used for Port wine production-first results

The production of Port Wine requires the addition of grape spirit to stop the fermentation, ensuring the desired sweetness

Aroma profile of ‘Pedro Ximenez’ sweet musts obtained from dried grapes by different methods

Aroma fraction of musts from grapes ‘Pedro Ximenez’ traditionally sun-dried and chamber-dried at 40 ºC and at 50 ºC during 8, 5 and 4 days respectively, destined for the production of sweet wines in Montilla-Moriles region (southern Spain) was studied.

Using unmanned aerial vehicle with multispectral camara to efficiently and precisely monitor the incidence of downy mildew and technical maturity of beibinghong (vitis amurensis Rpru.) grapes 

Multispectral unmanned aerial vehicle (UAV) has been successfully applied in monitoring vine vegetative growth, however, there are still potential relationships between remote sensing vegetation indexes (vis) and vine condition or grape quality, so it is worthy a deeper investigation to make a better use of UAV. One of the purposes of the study is to find out vis that could denote the severity of downy mildew (DM), so that precise and differentiated control strategies would be adopted subsequently.