GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Behaviour of two training systems for mechanical pruning combined with different nitrogen fertilizations on cv. Colombard

Behaviour of two training systems for mechanical pruning combined with different nitrogen fertilizations on cv. Colombard

Abstract

Context and purpose of the study – Today winegrowers involved in mechanical winter pruning are applying this viticultural technique on two main training systems, the free cordon, appearing to be the more efficient, and the trellised vertical shoot positioning (VSP) system. The main reasons for maintaining the trellis are generally due to common habits in vineyard management, risk of wind damage for the shoots, or risk of decrease in photosynthesis potential. The aim of the study was to assess the effects of the two training systems on vine. In addition, different nitrogen fertilization levels were applied on the two systems to evaluate the best combination to achieve yield and grape quality.

Material and methods – Free cordon and spur pruned VSP system were compared during 3 vintages, from 2016 to 2018, on a rainfed cv. Colombard, planted in 2012 in Gascony vineyard, south-west of France. The trial was run on a young plot, planted in 2012, with a production goal of around 15 tons per hectare. Four strategies of nitrogen fertilization were applied on each system including soil mineral supplies (40N and 80N/ha) and foliar spraying (25N/ha) combined with green manure on each treatment (control). Total foliar area, yield, pruning weight, nitrogen and water status were controlled each year. Grapes composition at harvest and wine quality also allowed to compare the different treatments.

Results – The results showed different behavior of the vine according to the training systems. Total leaf area and yield were significantly lower for the free cordon system each of the tree years, regardless of nitrogen fertilizations. With the same leaf-fruit ratio, in 2017 and 2018, the free cordon grapes contained less sugar than VSP grapes. To explain some of these differences, discussion will take place around plot’s age and on plant development delay due to higher height of the supporting wire for free cordon system. Also, in our conditions, the rainfed free cordon development appeared to be very dependent on the height and period of shoot trimmings. The different fertilization strategies induced significant results on chlorophyll index of the leaves every year and on yeast assimilable nitrogen of grapes after the second year. The berries from the control treatment presented the lowest concentration of nitrogen and the foliar treatment the highest. But, the nitrogen fertilization supplies did not modify yield and pruning weight for both systems. The three-year treatments were not sufficient to induce major differences in these cases.

Download the PDF

DOI:

Publication date: September 28, 2023

Issue: GiESCO 2019

Type: Poster

Authors

Thierry DUFOURCQ1,2, Elodie GASSIOLLE1, Frédéric LOPEZ1, Laure GONTIER2, Christophe GAVIGLIO2

1 IFV Sud-Ouest, Château de Mons, 32100 Caussens, France
2 IFV Sud-Ouest, V’innopôle, 81 310 Lisle Sur Tarn, France

Contact the author

Keywords

free cordon, Vertical Shoot Positioning, nitrogen fertilization, Colombard

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

Exploring the gene regulatory networks of WRKY family in grapevine (Vitis vinifera  L.) using DAP-Seq

The recent development of regulatory genomics has raised increasing interest in plant research since transcriptional regulation of genes plays a pivotal role in many biological processes. By shedding light on the target genes of the various transcription factors (TFs), it is therefore possible to infer the influence they exert on the different molecular mechanisms. In this regard, the attention was focused on WRKYs, a family of TFs almost exclusively found in plant species. In grapevine, WRKYs are involved in several biological processes, playing a key role in berry development, hormonal balance and signalling, biotic and abiotic stresses responses, and secondary metabolites biosynthesis.
Read More

Saccharomyces cerevisiae intraspecies differentiation by metabolomic signature and sensory patterns in wine

AIM: The composition and quality of wine are directly linked to microorganisms involved in the alcoholic fermentation. Several studies have been conducted on the impact of Saccharomyces cerevisiae on volatile compounds composition after fermentation. However, if different studies have dealt with combined sensory and volatiles analyses, few works have compared so far the impact of distinct yeast strains on the global metabolome of the wine.

Read More

ANALYZING THE ROLE OF ELEMENTAL SULFUR IN GRAPE JUICE ON THE DEVELOPMENT OF POLYFUNCTIONAL MERCAPTANS IN SAUVIGNON BLANC WINES

Sauvignon blanc is characterized by distinctive aromas, both fruity and herbaceous. The “green” character has been attributed to the methoxypyrazines, while the “fruity” character is associated with polyfunctional mercaptans . Polyfunctional mercaptans are of great significance due to their high impact on wines and associated low perception thresholds.
Elemental sulfur (S⁰) is widely used to protect grapevines from powdery mildew.

Read More

Xylem vessel blockages in grape pedicel growing in tropical climate observed by microtomography

In grape berry pedicel, xylem hydraulic conductance can be impaired by blockage deposition in the lumen of xylem elements. However, the varietal difference of the interruptions has not yet been characterized. In this preliminary work, we utilized synchrotron x-ray computed microtomography experiments performed at MOGNO beamline (LNLS – Brazil) to identify possible blockage sites in natural grape pedicel xylem. For this, we imaged dehydrated pedicel’s stem portion from the Niagara Rosada variety in three different phenological stages (Pre-veraison (PreV), veraison (V) and post-veraison (PostV). The reconstructed tridimensional images with a voxel size of 1.16 µm were segmented for the identification of xylem vessel lumens. After analysing one pedicel stem per stage, we identified 658 vessels without occlusion throughout his axial plane and 41 in which we could identify possible interruptions.

Read More

Ceramic imprint in wine: influence of hydraulic ratio on ceramic dissolution and wine pH in amphorae systems

This interaction is primarily due to an acidic attack on the ceramic by the wine. It results in (1) the dissolution of the ceramic into the wine and the release of a wide variety of elements; and (2) an increase of the wine pH. The extent of these effects depends on the mineralogical and chemical composition of the ceramic, as well as the hydraulic ratio of the ceramic-wine system (the term hydraulic ratio (ρ) defines here the volume of wine over the surface area of the ceramic in contact with the wine).

Read More