Terroir 2008 banner

Modelling grape and wine quality through PLS Spline statistical method

Abstract

Started in 1994, this project intends to explain quality of grapes and wines using data of soil, climate and vineyard that are currently used in field trials. Firstly set at a national scale, it has been transferred to the Aquitaine region in 2000. The work has been conducted by the ITV institute thanks to many other partners. 2 cultivars have been considered: cvs. Merlot and cabernet sauvignon.
A set of data has been collected using different years and plots showing varied environnemental and cultural situations. Data mining used PLS Spline method. 4 models have been produced: sugar and total acids in musts, colour intensity and total polyphenolic compounds in wines. These models point out the variables that are most influent on quality and order them. A validation with plots that have not been used to build the models has been done in 2006. The prediction is of correct level and gives a potential-like result. At the same time, the models have been integrated into a better convenient tool called SPQV 1.1 software. It is aimed to farmers’s advisors.
The models do not give any prediction during the year the grapes are produced, because it uses post-harvest variables. Nevertheless they can be a helpful tool for potential zoning, plots selection or planting advising.

Download the PDF

DOI:

Publication date: December 8, 2021

Issue: Terroir 2008

Type : Article

Authors

CLAVERIE M., PRUD’HOMME PY., MONGENDRE J., ZABOLLONE E., RAYNAL M., COULON T. (1), DURAND J.F. (2), MAZEIRAUD JF., RIVES C. (3), LAVAL C. (4), LAPORTE R. (5), FORGET D. (6)

(1) Institut Français de la Vigne et du Vin (ENTAV-ITV France), Station régionale Aquitaine, 39 rue Michel Montaigne, Blanquefort, France
(2) Laboratoire de Probabilités et Statistiques, Université de Montpellier II, Montpellier, France
(3) Chambre d’Agriculture de Lot-et-Garonne, 271 rue de Péchabout, Agen, France
(4) Chambre d’Agriculture de Dordogne, CRDA du Bergeracois, Monbazillac, France
(5) Chambre d’Agriculture des Landes, Mont de Marsan, France
(6) INRA Domaine expérimental de Couhins, Villenave d’Ornon, France

Contact the author

Keywords

vine, quality, model

Tags

IVES Conference Series | Terroir 2008

Citation

Related articles…

Exogeneous C-S lyase enzyme, a potential tool for thiol enhancement in wine or beer?

Varietal thiols are considered for years as key aroma compounds in many wines. Their main origin is the cleavage during alcoholic fermentation of S-conjugate precursors present in grapes and musts, even if the levels of precursors already identified struggle to completely explain the levels of thiols found in wine.

Read More

French regulations related to vineyard spraying and examples of devices developed in France and around the world to limit the risks of point-source pollution

Managing pests in vineyards presents a major challenge for winegrowers, who are seeking effective solutions to control diseases and pests.

Read More

Vacuum distillation of Muscaris pomace: temperature effects on aroma composition

The consumption of wine in traditional wine-producing countries like Italy, Spain, and France is decreasing.

Read More

Influence of the “terroir” (soil, climate and wine grower) on the quality of red Grenache wines in the Rhône Valley

«L’Observatoire Grenache» est un réseau de parcelles qui a été mis en place par l’Institut Rhodanien en Vallée du Rhône sur les millésimes de 1995 à 1999. Composé de 24 parcelles de Vitis vinifera L. cv Grenache noir, ce réseau vise à étudier l’influence du terroir (sol, climat et vigneron) sur la qualité des vins. Les parcelles ont été choisies afin de représenter différentes situations géographiques et géopédologiques de la vallée du Rhône. Le matériel végétal (clone, porte-greffe), la taille (cordon de Royat), la densité et l’âge de la parcelle ont été encadrées. Ainsi les conditions de milieu (sol, climat) et les pratiques du vigneron étaient les principales sources de variations.

Read More

Cover crop management and termination timing have different effects on the maturation and water potentials of Glera (Vitis vinifera L.) in Friuli-Venezia Giulia

Inter-row soil tillage in vineyards, stimulates vigor and production due to the absence of competition for water and nutrients, however negatively affects organic matter content, soil erosion, and compaction, resulting in reduced fertility. In this study, we investigated the effects of different cover crop management approaches, including cultivation type and termination timing, on the physiological and productive responses of a Glera vineyard.
The experimental trial was conducted in Precenicco (UD) from 2019 to 2021. A commercial mixture for autumn cover cropping was sown in alternating rows, and the sowing pattern was changed each year.

Read More