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Relationships between climate indices, phenology and berry composition of Touriga Nacional in the Dão wine region
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Autores
Orientador(es)
Resumo(s)
Despite the expansion and increasing popularity of Touriga Nacional in Portugal, there has not
been extensive research into the variety’s response to different climate characteristics. The
objective of this research was to test the relationships between different climate indices and
berry composition and Phenology in Touriga Nacional in the Dão winegrowing region of
Portugal. From the available data we can also explore any evolution of the climate, berry
composition and phenology during the recorded years.
Climate and plant data were analysed from records collected at the ‘Centro de Estudos
Vitivinícolas do Dão’ in the Dão wine region of northern Portugal between 1963-2010. Six
common climate indices were calculated from the climate data for each year of the recorded
period. Berry composition and phenology records of Touriga Nacional planted at the research
centre from the same period were also analysed. Any trends or changes in climate or plant data
were analysed over the recorded period. All climate indices were correlated against the plant
data results to investigate any relationships.
An increase in the Growing Season Temperature Index (GST) during the studied period was
observed that agreed with studies over a similar period in other parts of Europe. Various climate
indices had some correlations with grape and vine parameters; generally acidity showed a
reduction with increases in temperature-based indices. Budburst and harvest dates were
confirmed to be hastened by higher temperatures. Also yield had a positive correlation with the
Huglin Index (HI). HI had a better correlation with plant parameters because it is calculated over
a 6-month (instead of 7-month) period.
Understanding the relationship between Touriga Nacional and climate indices can help
producers maximise the potential of this important Portuguese variety, as well as aid its
expansion into other Portuguese regions and other regions throughout the world
Descrição
Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
Palavras-chave
Touriga Nacional climate phenology berry composition yield rootstock
Contexto Educativo
Citação
Birks, P.M. - Relationships between climate indices, phenology and berry composition of Touriga Nacional in the Dão wine region. Lisboa: ISA, 2012, 72 p.