Terroir 1996 banner
IVES 9 IVES Conference Series 9 Valorisation of integrated research on vineyard soils. Adaptation to the Val de Loire vineyard

Valorisation of integrated research on vineyard soils. Adaptation to the Val de Loire vineyard

Abstract

[English version below]

La mise en valeur d’un terroir au travers du vin signifie dans un premier temps le respect du cahier des charges de l’A.O.C correspondante. Dans un second temps, elle sous-entend d’être à l’écoute des évolutions scientifiques, techniques et sociétales afin de satisfaire une production plus respectueuse de l’environnement et de la santé des hommes. Les recherches effectuées par l’Unité Vigne et Vin du centre INRA d’Angers ont débouché sur le concept d’UTB, Unité Terroir de Base (R.Morlat). UTB définit une aire de terrain ou le fonctionnement de la vigne est homogène en tous points. En Anjou, un modèle de terrain «roche, altération, altérite» basé sur la profondeur de sol et le degré d’altération de la roche mère a été mis en évidence. Le premier axe du travail présenté est une tentative de classement des principaux types de sols du Val de Loire pour lesquels la vigne a un comportement physiologique spécifique. Par rapport à ce modèle, cinq familles ont été identifiées. Le second axe de travail consiste à proposer un itinéraire agroviticole en relation avec cette classification, basé sur le référentiel national pour la production intégrée de raisins (ITV FRANCE, 2000), et sur les expériences déjà menées en Val de Loire. En fonction de la typologie des sols rencontrés et des différents cépages autorisés, l’adéquation optimale terroir/portegreffe/cépage est recherchée. Le résultat final apparaît sous la forme d’un «Guide des Bonnes Pratiques Vitivinicoles du Val de Loire» pour l’objectif recherché suivant:
«Le bon cépage, au meilleur endroit, pour un type de vin recherché, bien valorisé !»

The valorisation of a terroir through its wine means, first of all, the respect of the corresponding AOC regulations. Secondly, it means one must carefully watch the technical, scientific and social evolutions in order to offer a product more respectable of the environment and society. The research carried out INRA in Angers has led to the UTB concept (Basic Terroir Unit). The UTB defines an homogeneous area for the functioning of the vine. In Anjou, a terrain model “rock type soil, intermediate type and weathered type soil “has been developed, based on the depth of the soil, and its degree of weathering. A first part of the present work is an attempt to classify the major types of the Val de Loire soils. According to the model, five types have been identified. The second part of the work proposes a set of technical itinery in relation to this classification and based on the “integrated grape production” national reference proposed by ITV FRANCE (2000) as well as some experiments conducted in the Loire Valley. According to the soils types and the authorized varieties, an optimal adequacy between the terroir, the rootstock and the variety is sought. The final results will be published in a “Guide: for good practices in the Loire vineyard”. Its unique ambition is to propose some areas for discussion between the vinegrower and his technical partners. All kinds of viticulture, be it conventional, integrated, organic, will be taken into account.
The main objective will be: “The right variety, at the right place, for a well valorised expected type of wine !”

DOI:

Publication date: February 15, 2022

Issue: Terroir 2002

Type: Article

Authors

D. PASQUINI*, C. ASSELIN** and F. JOURJON***

* D.PASQUINI, Interloire, 12 rue Etienne Fallu – 37019 TOURS CEDEX 01 / ESA Angers 55 rue Rabelais, 49000 Angers
**C. ASSELIN, / Unité vigne et vin, Centre INRA, 42 rue G. Morel 49071 Beaucouzé ou Interloire, 73 rue Plantagenêt, BP 52327, 49023 ANGERS CEDEX 02
*** F. JOURJON, Enseignant chercheur ESA Angers, 55 rue Rabelais, BP 748, 49007 ANGERS

Keywords

Terroir, Viticulture, Val de Loire, Vin, Interprofession
grapevine, soil, quality, Val de Loire, wine

Tags

IVES Conference Series | Terroir 2002

Citation

Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.