Terroir 2020 banner
IVES 9 IVES Conference Series 9 Effects of soil characteristics on manganese transfer from soil to vine and wine

Effects of soil characteristics on manganese transfer from soil to vine and wine

Abstract

Aim: In recent times the export of Beaujolais wines has been jeopardised due to a limit of manganese content (Mn) in wine implemented by China (2 mg/L), related to suspicions of potassium permanganate fraud. Nevertheless, soil Mn content may be high in some soil types in Beaujolais. The aim of this study was to improve knowledge of manganese transfer from soil to vine and wine because data on this subject is scarce.

Methods and Results: Recent pedologic mapping of Beaujolais vineyards has enabled a Mn monitoring network to be set up in order to study Mn transfer from soil to vine and wine. Three soil types were considered. Two of the soils can be very high in EDTA Mn: soils from clays with cherts (soil type 7) and former piedmont deposits with leached soils (soil type 8). The third soil, though low in Mn, is the most important and symbolic of Beaujolais: granitic soil. Fifteen plots of Gamay were monitored during 3 years (2015-2017). Besides soil analysis made from pedologic pits, Mn content of petiole, must and wine (red standard wine-making of 40 kg grapes) were determined, as well as grape yield and biomass (pruning weight). Results show that Mn in petioles is better correlated with Mn in wine than Mn in must. Mn content of wine is little in relation with EDTA Mn in soil. It increases when soil pH or cation exchange capacity decreases.

Conclusions: 

This study has shown that Mn concentration in wine can be naturally very high (maximum of 14.6 g/L in this study). Soils with low cation exchange capacity and/or low pH, i.e. soil types 1 and 8, resulted in higher Mn content in wine. Low cation exchange capacity does not allow a great Mn fixation on clay-humic complex and low pH soil solubilizes metal generally and Mn in particular, so it can be taken up by the vine. Mn petiole content is a very good indicator of Mn content in wine. Maceration in red wine-making is also an element to take into consideration.

Significance and Impact of the Study: Mn content in Beaujolais wine can be very high because of soil type, rather than fraud. It is important to highlight this for wine exportations. Mn content in wine can be reduced by correcting the soil pH.

DOI:

Publication date: March 17, 2021

Issue: Terroir 2020

Type: Video

Authors

Jean-Yves Cahurel1, Pierre Martini1*, B. Chatelet2, I. Letessier3

1Institut Français de la Vigne et du Vin, 210 boulevard Vermorel, CS 60320, 69661 Villefranche-sur-Saône, France
2Sicarex Beaujolais, 210 boulevard Vermorel, CS 60320, 69661 Villefranche-sur-Saône Cedex, France
3Sigales, 453 route de Chamrousse, 38410 St Martin d’Uriage, France

Contact the author

Keywords

Manganese, terroir, soil, Beaujolais, vine, wine

Tags

IVES Conference Series | Terroir 2020

Citation

Related articles…

Correlations between sensory characteristics and colloidal content in dry white wines

Must clarification is an important step occurring just after grape extraction in the elaboration of white wine, consisting in a solid-liquid separation. Traditionally, low must turbidity, around 50-150 NTU, is generally reached in white winemaking in order to prevent reductive aromas and facilitating alcoholic fermentation. Alternatively, a higher turbidity (300 NTU or above) can be sought for reasons such as a better expression of grapes identity (terroir), or for getting a must matrix that could supposedly lead to wines having greater ageing potential.

New fungus-resistant grapevine varieties display high and drought-independent thiol precursor levels

The use of varieties tolerant to diseases is a long-term but promising option to reduce chemical input in viticulture. Several important breeding programs in Europe and abroad are starting to release a range of new hybrids performing well regarding fungi susceptibility and wine quality.

The wine country, between landscape and promoting tool. The example of Chinon and Saint-Nicolas-de-Bourgueil vineyards (France)

When talking about wine, terroirs are never too far. The National Institute of Apellation d’Origine (INAO) defines it as a system inside of which interact a group of human factors, an agricultural production and a physical environment.

Soil and nutritional survey of Greek vineyards from the prefecture of Macedonia, Northern Greece, and from the island of Santorini

Vitis vinifera L. is one of the most important cultures for the soil and
climate conditions of Northern Greece and Santorini. However, very little information is provided with regard to its nutritional requirements and critical levels of nutrient deficiencies and toxicities. The aim of this study was to provide an integrated nutritional survey for the Greek conditions of wine and table varieties.

Zoning like base instrument for the agronomist’s work in vineyard

Ad una prima analisi l’interesse dimostrato dal settore produttivo nei confronti della zonazione vitivinicola è da ricondursi al fatto che dopo i primi approcci puramente accademici