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Instituto Politécnico de Bragança (2020)

Influence of deficit irrigation and canopy structure on water stress management of Touriga Nacional (Vitis vinifera L.) in Douro Demarcated Region

Damasceno, Ana Flávia Bonatto

Titre : Influence of deficit irrigation and canopy structure on water stress management of Touriga Nacional (Vitis vinifera L.) in Douro Demarcated Region

Auteur : Damasceno, Ana Flávia Bonatto

Université de soutenance : Instituto Politécnico de Bragança

Grade : Master in Agroecology 2020

Résumé
A worldwide relevant winemaking place, the Douro Demarcated Region, located in Northeast Portugal, is characterized by its Mediterranean climate, with a marked water deficit in the summer period and high temperatures. This aspect may reduce vineyards’ productivity and quality. Within the scope of this master’s thesis, this study proposed to understand the vineyard relations with the climate changes at the Douro Demarcated Region, establishing three different levels of deficit irrigation (25, 50, and 75% ETc) and two control fields (non-irrigated). Besides the water stress condition, plants were trained in different canopy heights (tall and short) to understand its influence on physiological and agronomical parameters. Evaluation of evapotranspiration (ETc), predawn water potential, NDVI, CCI, leaf gas exchange, and leaf area took place throughout veraison. To control maturation, weight, diameter, and chemical characteristics of berries were measured. At harvest, FTIR proceded chemical characteristics of the must. Pruning weight and Ravaz index completed yield evaluations. The results of this research corroborate with previous studies, indicating that rainfed vines can have a lower yield at harvest than the ones irrigated, due to climatic stress conditions. Moreover, the rainfed vine with the shorter canopy structure could have a higher yield compared to the taller canopy.

Mots clés  : Vine Deficit irrigation Canopy structure Douro Demarcated Region

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