Autor(es):
Gouveia, J.P. 
; Pedroso, V. ; Rodrigues, P. ; Martins, S. ; Alves, I. ; Lopes, C.
Data: 2011
Identificador Persistente: http://hdl.handle.net/10400.5/5509
Origem: Repositório da UTL
Assunto(s): grapevine; Touriga Nacional; irrigation; vigour; yield; berry composition
Descrição
Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011 In a field trial installed at the Centro de Estudos Vitivinícolas do
Dão, Nelas, Portugal, the effect of three irrigation treatments on
the agronomic behaviour of cv Touriga Nacional (Vitis vinifera L.)
were studied during three growing seasons (2006-2008). Three
irrigation treatments (DI30 - irrigation with 30% of ETc; DI50 -
irrigation with 50% ETc, FI - full irrigation – 100% Etc) were
compared to a control non-irrigated treatment (NI). Compared to
NI, the deficit irrigation treatments (DI30 & DI50) showed no
significant differences on the yield and its components. The full
irrigation treatment induced a significantly higher yield due to a
higher bunch weight, as compared with the others treatments.
Compared to the control, the deficit irrigation treatments presented
similar berry composition during all the three seasons. The FI
treatment presented, in all seasons, a significantly higher total
acidity and a significantly lower Brix and total anthocyanins
concentration as compared to the other treatments. The pruning
weight and shoot weight increased with the amount of irrigation
water applied, but significant differences were found only between
the FI and the NI treatments, the last presenting the lowest values.
Despite the fact that in the non-irrigated vineyards of the Dão
winegrowing region it is very common to observe vine water
stress symptoms, mainly during the ripening period, during the
three studied seasons (2006-2008), the deficit irrigation treatments
showed no advantages relatively to the control non-irrigated.
Despite the higher yield produced in the full irrigation, this
treatment had the disadvantages of the excessive vine vigour and
lower must quality produced.
