italianoenglishfrançaisdeutschespañolportuguês
Language
Search
  • » Video
  • » The fear of dilution: rainfall, irrigation and grape ripening

The fear of dilution: rainfall, irrigation and grape ripening

Markus Keller, Washington State University

The fear of dilution: rainfall, irrigation and grape ripening

Many growers, wine makers, wine writers, and regulators do not like rainfall and irrigation during grape ripening, because they fear the water will “dilute” the quality of the grapes. This presentation discuss recent research by his group, which has demonstrated that grape berries control their own size and concentration by changing the inflow and outflow of water.

The beginning of ripening (veraison) is marked by a steep increase in sugar, and hence water, inflow to meet the demand of the berries. This enables the berries to ripen even under drought stress conditions. If the air is warm and dry enough, the berries dispose of the excess water by evaporating it across the skin. Under humid conditions, however, they recycle the water back to the leaves.

Laboratory data are supported by field trials and show that drip or flood irrigation during ripening does not cause a dilution of fruit quality. However, rainfall events and overhead sprinkler irrigation, or even just very humid conditions, not only prevent water evaporation from the berries but also lead to water uptake across their skin. Such water surplus will slow down sugar and color accumulation and can even lead to splitting of ripening berries. If the rain continues, it will wash out sugars and thus dilute the split berries. But if the rain stops, the split berries begin to shrink, which tends to concentrate them.

Therefore, whether such rainfall or overhead irrigation events will dilute fruit quality depends on how soon after their occurrence the grapes are harvested, and whether they have enough time to dry out before or after harvest. In addition, our research showed why grapes ripen faster under dry and warm conditions than under humid and cool conditions.

This video shows the OPENING SEMINAR of the 10th edition of Enoforum (May 16th-18th, 2017, Vicenza, Italy). Seminar sponsored by Ferrari

Annual Subscription to Infowine: The subscription – to the price of € 60,00 (VAT included) – gives unlimited access for one year to all the documents published on the website, historical archive included: Click here

Published on 12/06/2018
Item available in italiano
Premium Contents Area
  • VIDEO SEMINAR (Markus KELLER, streaming 21 min) - PART 1
  • VIDEO SEMINAR (Markus KELLER, streaming 23 min) - PART 2
Price:25 €(Tax included)
    • Presentation Ferrari srl,sponsor opening seminar
Related sheets
  • Discover all the benefits of Infowine Premium subscription for only € 60 /year
    Subscribe now to access to all the videos and technical articles on-demand, just with a click (computer, smartphone and tablet)!
    Price:60 €(Tax included)
    Published on:06/09/2016
  • Juan Manuel Martínez, Universidad de Zaragoza
    VIDEO SEMINAR ENOFORUM 2018: the objective of this research was to verify if the treatment of the lees by PEAV accelerated the release of mannoproteins during the aging on lees of a Chardonnay wine.
    Price:15 €(Tax included)
    Published on:14/11/2018
  • Matteo Perini, Fondazione Edmund Mach San Michele all’Adige
    Finalist of the International SIVE OENOPPIA awards 2017: In this work the potential of isotopic analysis of the (18)O/(16)O ratio in ethanol (expressed in d(18)O) was tested in improving the abilit...
    Price:25 €(Tax included)
    Info
    Or choose the subscription option:
    Published on:26/06/2018
  • Alberto Acedo, Biomemakers
    Alberto Acedo, of Biomemakers, introduces the researches and analysis on soil microbiome designed for the identification of bacterial and fungal species present in the vineyard.
    Published on:26/07/2018
  • Eduardo Dellacassa, DQO-CYTAL, Universidad de la República del Uruguay (UY)
    VIDEO SEMINAR ENOFORUM 2017: The aroma of the wine depends on the variety, vinification and aging, being the secondary metabolites of the grape responsible for the varietal character of the wines. ...
    Price:15 €(Tax included)
    Published on:13/09/2018
  • Piergiorgio Comuzzo, Dipartimento di Scienze Agroalimentari, Ambientali ed Animali, Università di Udine
    Finalist of the International SIVE OENOPPIA awards 2017: Sulfur dioxide, ascorbic acid, glutathione and an inactive dry yeast preparation were compared to assess their ability in protecting (+)-cat...
    Price:15 €(Tax included)
    Published on:11/06/2018
© All Right Reserved
ISSN 1826-1590 VAT: IT01286830334
powered by Infonet Srl Piacenza
Privacy Policy
This website and its related third-party services make use of cookies necessary for the purposes described in the cookie policy. If you want to learn more about cookies or how to disable them (either totally or partially), please see the cookie policy. By closing this banner, scrolling through this page, clicking on a link or continuing navigation in any other way, you consent to the use of cookies.
More informationOK

- A +
ExecTime : 2,5