terclim by ICS banner
IVES 9 IVES Conference Series 9 GiESCO 9 Cumulative effect (6 years) of deficit irrigation in two important cultivars of Douro region, Portugal

Cumulative effect (6 years) of deficit irrigation in two important cultivars of Douro region, Portugal

Abstract

Context and purpose of the study – Numerous studies have demonstrated the importance of irrigation in improving the grape yield and quality in areas with arid and semiarid climates, particularly in the context of ongoing climate changes. However, the introduction of irrigation in vineyards of the Mediterranean basin is a matter of debate, in particular in those of the Douro Demarcated Region (DDR), due to the limited number of available studies in this region. The present study aimed to evaluate how different irrigation deficits for 6 years would influence production and must quality in Touriga Francesa (TF) and Touriga Nacional (TN) varieties.

Material and methods – Field grown plants of cultivars TF and TN, were tested in a commercial vineyard, at Douro Superior sub-region, between 2015 and 2020. Vineyards are planted in a steep slope area (slope of 45%), in terraces of two rows, in a schistic and acidic soil. Three irrigation regimes were compared to a rain-fed treatment, R0, based on the estimated crop evapotranspiration (ETc): R25 (25% ETc), R50 (50% ETc), R75 (75% ETc). Irrigation was performed every 15 days, based on weather parameters recorded at the meteorological station located in the plot.

Results – Regarding the production, the number of clusters/vine in TN at different irrigation debts were as follows: R0 = R25 = R50 < R75 (11% higher). In turn, the yield was as follows: R75 > R0/R50 > R25.  In TF variety, the lowest number of clusters/vine was registered at R0 (24% lower than at R75), and the yield at all irrigation debts were higher than at R0. Considering the composition of the must of both varieties, evaluated during the six years of the trial, results showed that all irrigation debts did not change the sugar amount, pH and acidity (titratable and malic acid), nor phenolic compounds. In TN, values of pruning mass were higher at R75, while in TF the pruning mass was higher at R50. These results showed that irrigation in DDR did not significantly change berry quality traits and its effect in vine performance was inconsistent, thus suggesting that this agricultural practice should be implemented in a case-by-case scenario, depending on the cultivar, orientation, water holding capacity of the soil, microclimatic conditions, among others.

DOI:

Publication date: June 21, 2023

Issue: GiESCO 2023

Type: Article

Authors

Inês L. CABRAL1, António TEIXEIRA2, Tiago NOGUEIRA3, Susana M.P. CARVALHO1, Hernâni GERÓS2, Jorge QUEIROZ1*

1GreenUPorto – Research Centre on Sustainable Agrifood Production/Inov4Agro & DGAOT, Faculty of Sciences, Campus de Vairão, University of Porto, Rua da Agrária 747, 4485-646 Vairão, Portugal
2Centre of Molecular and Environmental Biology (CBMA), Department of Biology, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
3Quinta do Crasto, S.A., 5060-063 Gouvinhas, Portugal

Contact the author*

Keywords

climate change, evapotranspiration, grapevine, must composition, yield

Tags

GiESCO | GIESCO 2023 | IVES Conference Series

Citation

Related articles…

IMPACT OF HARVEST DATE ON THE FINE MOLECULAR COMPOSITION OF MUST AND BORDEAUX RED WINE (VAR. MERLOT, CABERNET SAUVIGNON). FOCUS ON ACIDITY AND SENSORY IMPACT AFTER FIVE YEARS OF AGING

Climate change has brought several impacts that are becoming increasingly intense during the last few years and put at risk the quality of the berries or even the plant’s sustainability. Such extreme climatic events impact the composition of the wine while modulating its quality and the consumer preferences (Tempère et al., 2019). The three most important changes that take place in the must are: 1) decrease acidity, 2) increase of the concentration of sugar, hence increase of alcohol in the wine, and 3) modification
of the sensory balance and the development for example of cooked fruit aromas.

IMPACT OF CLIMATIC ZONES ON THE AROMATIC PROFILE OF CORVINA WINES IN THE VALPOLICELLA REGION

In Italy, in the past two decades, the rate of temperature increases (0.0369 °C per year) was slightly higher compared to the world average (0.0313 °C per year). It has also been indicated that the number and intensity of heat waves have increased considerably in the last decades. (IEA, 2022). Viticultural zones can be classified with climatic indexes. Huglin’s index (HI) considers the temperature in a definite area and has been considered as reliable to evaluate the thermal suitability for winegrape production (Zhang et al., 2023).

A synthesis approach on the impact of elevated CO2 on berry physiology and yield of Vitis vinifera

Besides the increase in global mean temperature the second main challenge of a changing climate is the increase in atmospheric carbon dioxide (CO2) in relation to physiology and yield performance of grapevines. The benefits of increasing CO2 levels under greenhouse environment or open field studies have been well investigated for various annual crops. Research under free carbon dioxide enrichment on field-grown perennial plants such as grapevines is limited to a few studies. Further, chamber and greenhouse experiments have been conducted mostly on potted vines under eCO2 conditions.

Microbial ecosystems in wineries – molecular interactions between species and modelling of population dynamics

Microbial ecosystems are primary drivers of viticultural, oenological and other cellar-related processes
such as wastewater treatment. Metagenomic datasets have broadly mapped the vast microbial species
diversity of many of the relevant ecological niches within the broader wine environment, from vineyard
soils to plants and grapes to fermentation. The data highlight that species identities and diversity
significantly impact agronomic performance of vineyards as well as wine quality, but the complexity
of these systems and of microbial growth dynamics has defeated attempts to offer actionable
tools to guide or predict specific outcomes of ecosystem-based interventions.

Searching for the sweet spot: a focus on wine dealcoholization

It is well known that the vinification of grapes at full maturation can produce rich, full-bodied wines,
with intense and complex flavour profiles. However, the juice obtained from such grapes may have very
high sugar concentration, resulting in wines with an excessive concentration of ethanol. In addition, the decoupling between technological maturity and phenolic/aromatic one due to global warming, exacerbates this problem in some wine-growing regions. In parallel with the increase of the mean alcohol content of wines on the market, also the demand for reduced alcohol beverages has increased in recent years, mainly as a result of health and social concerns about the risks related to the consumption of alcohol.