terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Foliar application of urea improved the nitrogen composition of Chenin grapes

Foliar application of urea improved the nitrogen composition of Chenin grapes

Abstract

The nitrogen composition of the grapes directly affects the developments of alcoholic fermentation and influences the final aromatic composition of the wines. The aim of this study was to determine the effect and efficiency of foliar applications of urea on the nitrogen composition of grapes. This study was carried out during 2023 vintage and in the Chenin vineyard located in Estacion Experimental Mendoza (Argentina). Three urea concentrations 3, 6 and 9 Kg N/ha (C1, C2, and C3, respectively) and control (T) were applied in this vineyard at veraison. In all solutions were added 1ml/l of Tween 80 ® surfactant. In addition, the experimental design was a randomized block design with three. Also, each treatment was repeated one week later. The grapes were harvest at optimum maturity (20º Brix), harvested by hand and transported in separate boxes for each treatment and control. Subsequently, grapes samples were analysed to determine the oenological parameters (official methods), and the nitrogen composition, ammonium and amino nitrogen (OenoFoss™ autoanalyzer). In addition, the yeast assimilable nitrogen (YAN) content was calculated as the sum of ammonium and amino nitrogen. Finally, the results were studied statistically by analysis of variance (ANOVA) and differences between samples were compared by Duncan’s test (p-value ≤ 0,05). In 2023 vintage, C1 and C3 treatments improved the amino nitrogen content. In addition, ammonium nitrogen content was increased by C2 and C3 treatments. And YAN content was increased by all urea treatments and C3 treatment was the one that most increased the YAN concentration in must samples. Consequently, foliar applications of urea, applied at veraison, could be an agronomic practice to improve the nitrogen concentration in Chenin grapes.

Acknowledgements: Many thanks to the collaboration with researchers from Estación Experimental Mendoza. R. M.-P. thanks National Institute for Agricultural and Food Research and Technology (INIA) and Government of La Rioja for the predoctoral contract.

DOI:

Publication date: October 9, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Rebeca Murillo-Peña 1*, Teresa Garde-Cerdán 1, Mariela Assof 2,3, Santiago Sari 3, José María Martínez-Vidaurre 1, Martín Fanzone 2,3

1Instituto de Ciencias de la Vid y del Vino (Gobierno de La Rioja, CSIC, Universidad de La Rioja) Ctra. de Burgos, Km. 6. CP 26007 Logroño, La Rioja, España
2Universidad Juan Agustín Maza. Centro de Estudios Vitícolas y Agroindustriales. Lateral Sur del Acceso Este 2245.CP 5519 Guaymallén, Mendoza, Argentina
3Instituto Nacional de Tecnología Agropecuaria. Estación Experimental Mendoza. San Martín 3853. CP 5507EVY, Luján de Cuyo, Mendoza, Argentina

Contact the author*

Keywords

yeast assimilable nitrogen, veraison, Vitis vinifera L

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Applicability of grape native yeasts to enhance regional wine typicity

The universalization in wine production has been restricting the imprint of terroir in regional wines, resulting in loss of typicity. Microbes are the main driving force in wine production, conducting fermentation and originating a myriad of metabolites that underly wine aroma. Grape berries harbor an ecological niche composed of filamentous fungi, yeasts and bacteria, which are influenced by the ripening stage, cultivar and region. The research project GrapeMicrobiota gathers a consortium from University of Zaragoza, University of Minho and University of Tours and aims at the isolation of native yeast strains from berries of the wine region Douro, UNESCO World Heritage, towards the production of wines that stand out in the market for their authenticity and for reflecting their region of origin in their aroma.

Phenolic extraction and dissolved oxygen concentration during red wines fermentations with Airmixig M.I.™

During red wine fermentation, the extraction of phenolics compounds and sufficient oxygen provision are critical for wine quality [1,2]. In this trial, we aimed at evaluating the kinetics of phenolic extraction and dissolved oxygen during red wine fermentations using the airmixing system. Twenty lots of red grape musts were fermented in 300.000 L tanks, equipped with airmixing, using two injection regimes (i.e., high and low intensity, and high and low daily frequency). An oxygen analyzer was introduced into the tanks in order to record the concentration of dissolved oxygen over time.

New varieties descendant from Monastrell with lower sugar and high phenolic content adapted to warm climates

Given that climate change is a continuous process, it is necessary to constantly search for new strategies that help the viticulturist sector to mitigate its consequences. All adaptation strategies will have a greater or lesser effect that in turn will be marked by the times of action. As a long-term action, a genetic breeding program to obtain new varieties descendant from Monastrell has been developed in the Region of Murcia (more specifically, in the IMIDA Research Center) since 1997. In this program, new red varieties have been developed through directed crosses of the Monastrell variety with other varieties such as Cabernet Sauvignon, Tempranillo and Syrah.

Combined abiotic-biotic plant stresses on the roots of grapevine

In the 19th century, devastating outbreaks of phylloxera (Daktulosphaira vitifoliae Fitch), almost brought European viticulture to its knees. Phylloxera does not only take energy in form of sugars from the vine, but also affects the up- and down- regulations of genes, acts as a carbon sink and reprograms the physiology of the grapevines, including nutrient uptake and the defense system [1]. A key trait of rootstocks is the ability to perform well under high lime conditions as about 30 % of the land surface has calcareous soil. Iron deficiency not only causes the well-known problems of lime-induced chlorosis and stunted growth, but also affects the entire plant metabolism.

Early defoliation positively enhances bioactive composition of berries with no effect on cuticle characteristics

Leaf removal in the fruit-zone has been employed to improve cluster light exposure and ventilation and therefore increase metabolite accumulation and reduce botrytis incidence in berries. When applied before flowering (early defoliation – ED), it can also decrease cluster compactness and regulate yield in high-yielding varieties. This study aimed to evaluate the impact of ED on the physiology and metabolism of Aragonez (syn. Tempranillo) berries along the ripening period. The experiment was set up in 2013 at a commercial vineyard located in the Lisbon winegrowing region.