GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 GiESCO 2019 9 Nitrogen partitioning among vine organs as a consequence of cluster thinning

Nitrogen partitioning among vine organs as a consequence of cluster thinning

Abstract

Context and purpose of the study ‐ Agroscope is investigating the impact of yield on nitrogen (N) partitioning in grapevine and on must composition. The mechanism of N assimilation, partitioning and 15 mobilization from the reserves is studied through foliar application of N isotope‐labelled urea over a two‐year period. The final scope is to optimize fertilizer use efficiency and grape composition. Here are summarized the results from the first year of experimentation.

Material and methods ‐ Two blocs (control and test) of 12 homogeneous potted grapevines each (Vitis vinifera L. Chasselas) were grown under field conditions. During summer 2017, cluster thinning allowed to create a large yield gradient (from 0.5 to 2.5 kg/m2 of soil). Vegetative development—canopy weight, leaf area, photosynthesis activity—and yield parameters —bud fruitfulness, bunch and berry weights, number of bunches and total yield per vine— were measured. All the vines were excavated at harvestand the organs were separated (roots, trunk, canopy, pomace and must), with the aim of monitoring N partitioning in the plant. The test bloc received 20 kg/ha of foliar‐applied 15N labelled urea at veraison. Total organic carbon and nitrogen and their stable isotope compositions were determined in each organ, using EA‐IRMS. The musts were analysed for their content of soluble sugars, acids, NH4+ and amino acids.

Results ‐ Grapevine compensated higher N demand from the grapes by assimilating more N through leaves and roots and mobilizing more N from reserves. The foliar supply of urea limited N mobilization from the roots, preserving the reserves for the following year. Must amino‐acid profiles varied significantly with the yield. Yield had no impact neither on vegetative development nor on grape maturation. With increasing yield, N concentration remained constant in the canopy and grapes at harvest, to the detriment of the N content in roots. Urea assimilation was positively correlated with the yield (r = 0.68, P = 0.029). Urea supply had a positive impact on yeast assimilable nitrogen concentration in the must only under higher yield conditions. 

Download the PDF

DOI:

Publication date: June 19, 2020

Issue: GiESCO 2019

Type: Article

Authors

Thibaut VERDENAL (1,2), Jorge E. SPANGENBERG (2), Vivian ZUFFEREY (1), Agnes DIENES‐NAGY (1), Olivier VIRET (3), Cornelis VAN LEEUWEN (4), Jean‐Laurent SPRING (1)

(1) Agroscope, Av. Rochettaz 21, CH-1009 Pully, Switzerland
(2) Institute of Earth Surface Dynamics, University of Lausanne, CH-1015 Lausanne, Switzerland
(3) Direction générale de l’agriculture, de la viticulture et des affaires vétérinaires (DGAV), Av. de Marcelin 29, CH-1110 Morges, Switzerland
(4) EGFV,Bordeaux Sciences Agro, INRA, Univ. Bordeaux, ISVV, F-33882 Villenave d’Ornon, France

Contact the author

Keywords

 Nitrogen, partitioning, yield, foliar urea, isotope labelling, amino acids

Tags

GiESCO 2019 | IVES Conference Series

Citation

Related articles…

IMPACT OF MUST NITROGEN DEFICIENCY ON WHITE WINE COMPOSITION DEPENDING ON GRAPE VARIETY

Nitrogen (N) nutrition of the vineyard strongly influences the must and the wine compositions. Several chemical markers present in wine (i.e., proline, succinic acid, higher alcohols and phenolic compounds) have been proposed for the cultivar Chasselas, as indicators of N deficiency in the grape must at harvest [1]. Grape genetics potentially influences the impact of N deficiency on grape composition, as well as on the concentration of potential indicators in the wine. The goal of this study was to evaluate if the che- mical markers found in Chasselas wine can be extended for other white wines to indicate N deficiency in the grape must.

Read More

Prospects for enlarging of microzone Manavi in the East Georgia

The experimental studies conducted in the eastern Georgia in Sagarejo administrative district on the foothills of the southern slope of Tsiv-Gombori range reveal the possibility of enlarging Manavi traditional specific zone to the north-west (from Giorgitsminda to Khashmi), at 500-750 m above sea level.

Read More

Health benefits of winemaking by-products: in vitro study of the phenolic profile and potential healthy properties

The wine sector plays a significant role in the international agri-food industry, with the winemaking process leading to the generation of considerable amounts of by-products. Among these by-products, grape pomace, is one of the most abundant resources, mainly finding application in the production of distillates, fertilizers, and animal feed.

Read More

Characterization of non-cultivated wild grapevines in Extremadura (Spain) 

Several Eurasian wild grapevine populations were found along Extremadura region (southwestern Spain). For conservation and study, one individual from four different populations (named L1, L2, L5 and L6) was vegetatively propagated and planted at Instituto de Investigaciones Agrarias Finca La Orden (CICYTEX), Badajoz. The aim of the present work was to characterize those conserved individuals from four different populations based on both an ampelographic description and a molecular analysis. Three vines per individual were studied.

Read More

Market entry strategies in the U.S. alcohol distribution: The case of French wine exporters

This study examines the different strategies adopted by wine exporters located in France for penetrating international alcohol distribution networks in the U.S. market (and to a lesser extent the Canadian market). Grounded in the Business-to-Business (B2B) marketing literature (Ellegaard and Medlin, 2018), this study adopts a framework integrating a ‘Stakeholder’ approach for understanding the logics behind exporters’ strategies to penetrate the alcohol distribution networks (wholesalers, importers, alcohol monopolies).

Read More