Terroir 1996 banner
IVES 9 IVES Conference Series 9 Enological characters of thirty vines in four different zones of Tuscany

Enological characters of thirty vines in four different zones of Tuscany

Abstract

In the last few years the development of HPLC techniques together with multivariate statistical methods allowed to set methodics of large discriminant and classing efficacy in the study of wine-grapes.
The phenolic compounds (cynnamic acids and anthocyanidins) in thirty different wines grown in 4 different zones of Tuscany (Arezzo, Grosseto, Pisa and Lucca) have been analyzed by HPLC.
The analytical data were statistical worked out by two analysis ACP and a linear discriminant analisys in order to discriminate the four zones, using Fisher linear function.
The stepwise technique, to choose variables, pointed out the delphinidin-g, the peonidin-g, the ratio of three/two-sostituited anthocyanines, the sum of cis and trans-cutaric acids, the caffeic acid and the ratio of caffeic acid and the sum of cutaric acids among the most important.
Then we worked out 6 comparisons between two zones and exactly AR/LU, AR/PI, AR/GR, LU/PI, LU/GR and PI/GR.
The environment discriminant threshold, the differences, the discriminant functions of vine-variety in every zone and the measure of discrimination errors were obtained.
Therefore a vinevariety-environment interaction is quite probable.

DOI:

Publication date: February 24, 2022

Issue: Terroir 2000

Type: Article

Authors

A.Piracci, P.Storchi, P.Bucelli, F. Giannetti, V. Faviere

Istituto Sperimentale per l’Enologia ​Via di Vertine 1 ​53013 Gaiole in Chianti (SI)
Istituto Sperimentale per la Viticoltura – Arezzo

Contact the author

Tags

IVES Conference Series | Terroir 2000

Citation

Related articles…

Determination of aromatic characteristics from Syrah and Tempranillo tropical wines elaborated in Northeast Brazil

Dans la region Nord-Est du Brésil, située à la Vallée du São Francisco, localiséee entre les paralleles 8-9º HS, la production de vins tropicaux a commencé il y a une vigntaine d’années. Dans cette région, il est possible d’avoir au minimum deux récoltes par an, car la moyenne de température est de 26 ºC, avec une pluviosité moyenne de 550 mm entre les mois de janvier-avril.

Phototropic and geotropic shoot orientation: effect on physiological, vegetative and reproductive parameters

[English version below]

On a étudié l’effet de l’orientation des rameaux sur les paramètres physiologiques, végétatifs et reproductif durant deux saisons de croissance (2002/2003 et 2003/2004) dans la région de Stellenbosch dans une vignoble du cépage Merlot sur 99R conduite en espalier et taillé à cordon coursonné. Les vignes étaient espacées 2.7 x 1.5 m.

Importance des propriétés optiques de la surface du sol sur le microclimat de la vigne. Répercussions de l’usage d’un revêtement de sol réfléchissant sur la composition des moûts et sur la qualité du vin

Cette recherche a eu pour but l’étude des effets d’un renforcement radiatif et thermique sur les zones inférieures de la canopée de la vigne (solarisation par des films ou des paillages réfléchissants installés sur le sol, sous les ceps), notamment l’étude de leurs conséquences sur la composition biochimique des moûts à la vendange et sur la qualité des vins.

Upscaling the integrated terroir zoning through digital soil mapping: a case study in the Designation of Origin Campo de Borja

homogeneous zones by intersecting several partial zonings of major factors that influence vineyard growth. Each of them follows specific process from their corresponding disciplines. Soil zoning specifically refers to a Soil Resource Inventory map that has traditionally been generated by conventional soil mapping methods. These methods have shortcomings in reaching fine cartographic and categorical details and involve significant expenses, which undermines their applicability. A new framework named Digital Soil Mapping has introduced quantitative models by statistical techniques to establish soil-landscape relationships and is able to provide intensive scale cartography.

In the present study, a microzoning at 1:10.000 scale is generated from an initial zoning, where the conventional soil map with polytaxic map units is replaced by a new one from digital techniques that disaggregates them. The comparison between the zonings considers a quantitative evaluation of capability for each Homogeneous Terroir Unit by means of the Viticultural Quality Index and its categorization based on its distribution by map. The spatial intersection of both maps gives rise to a confusion matrix in which the flows of class variations after the substitution are assessed.

The results show a five-fold increase in the number of Homogeneous Terroir Units identified and a larger differentiation among them, evidenced by a wider range in the capability index distribution. Both elements are accompanied by an increase in the detection of areas of higher potential within previously undervalued uniform zones.These features are a direct effect of the improvements brought by Digital Soil Mapping techniques and would verify the advantages of their implementation in the Integrated Terroir zoning. Eventually, such new highly detailed terroir units would benefit precision viticulture and sustainable management practices.

OPTIMISATION OF THE AROMATIC PROFILE OF UGNI BLANC WINE DISTILLATE THROUGH THE CONTROL OF ALCOHOLIC FERMENTATION

The online monitoring of fermentative aromas provides a better understanding of the effect of temperature on the synthesis and the loss of these molecules. During fermentation, gas and liquid phase concentrations as well as losses and total productions of volatile compounds can be followed with an unprecedented acquisition frequency of about one measurement per hour. Access to instantaneous production rates and total production balances for the various volatile compounds makes it possible to distinguish the impact of temperature on yeast production (biological effect) from the loss of aromatic molecules due to a physical effect³.