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Master Thesis

Influence de la date et du mode de taille du Sauvignon blanc sur la maturation des baies et la vigueur dans une optique d’amélioration des rendements

Abstract : A continuous reconsideration of a "premier cru classé" such as Château Margaux led the château’s technical team to conduct studies to optimize white wine (Pavillon blanc, 100% Sauvignon blanc) yield whereas keeping its quality. Grapevine pruning is the key for this optimization process. Indeed, two pruning parameters (pruning date and type) are studied for several years to increase low yields (around 20hl/ha) while maintaining wine quality. Following previous vintages studies, Château Margaux Sauvignon blanc parcels are now simple Guyot pruned instead of the typical double Guyot pruning of the Médoc area. Late and Guyot pruning combination were studied, as late pruning allowed a protection against spring frost for decades. Grapevine yield, vigor and maturity were analyzed during 2019 vintage, combining pruning dates (early and late) and types (simple and double Guyot). According to results, simple Guyot pruning yields are significantly lower than double Guyot pruning yields, despite previous studies showing averse results. Moreover, simple Guyot pruning does not regulate grapevine vigor better than typical Médoc pruning. Despite sensorial analysis showing no variation during berries tastings, it seems simple Guyot pruning changed varietal aromas must concentrations. Furthermore, it seems late pruning does not affect berry maturity while allowing better yields than a frost sensitive early pruning.
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Master Thesis
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Submitted on : Monday, October 26, 2020 - 9:57:42 AM
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  • HAL Id : dumas-02971002, version 1

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Laurent David. Influence de la date et du mode de taille du Sauvignon blanc sur la maturation des baies et la vigueur dans une optique d’amélioration des rendements. Agronomie. 2019. ⟨dumas-02971002⟩

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