Articles
DENDROMETRIC MEASUREMENTS IN GRAPEVINE (VITIS VINIFERA L. ‘TEMPRANILLO’ AND ‘CABERNET SAUVIGNON’) UNDER REGULATED DEFICIT IRRIGATION
Article number
889_11
Pages
113 – 122
Language
English
Abstract
Measurements of trunk diameter fluctuations (TDF) were carried out in 2004 and 2006 in a grapevine (Vitis vinifera L.) experiment aimed at establishing criteria for irrigation scheduling based on TDF readings.
The experiment considered two cultivars (Tempranillo and Cabernet Sauvignon) under four regulated deficit irrigation (RDI) regimes.
The results from the first year showed that the dynamic of maximum trunk diameter (MXTD) was a good indicator of vine water status before veraison in the different treatments and cultivars.
By contrast, the maximum daily trunk shrinkage (MDS) was not as good indicator of water stress compared to MXTD, as no differences were found among RDI treatments, although they were highly significant (P<0.001) among cultivars.
In the second year of the experiment, only the two most extreme irrigation treatments were monitored with a double number of LVDT sensors to focus on stress detection.
The results confirmed those of 2004, with differences in water status, which were not well correlated with the MDS measurements.
However, the MDS differences among cultivars were confirmed to be highly significant and related to the inherent water relations of each cultivar.
It was concluded that, in grapevines, TDF measurements do not lead to the direct assessment of vine water status and therefore may not be best suited for the development of irrigation scheduling procedures.
The experiment considered two cultivars (Tempranillo and Cabernet Sauvignon) under four regulated deficit irrigation (RDI) regimes.
The results from the first year showed that the dynamic of maximum trunk diameter (MXTD) was a good indicator of vine water status before veraison in the different treatments and cultivars.
By contrast, the maximum daily trunk shrinkage (MDS) was not as good indicator of water stress compared to MXTD, as no differences were found among RDI treatments, although they were highly significant (P<0.001) among cultivars.
In the second year of the experiment, only the two most extreme irrigation treatments were monitored with a double number of LVDT sensors to focus on stress detection.
The results confirmed those of 2004, with differences in water status, which were not well correlated with the MDS measurements.
However, the MDS differences among cultivars were confirmed to be highly significant and related to the inherent water relations of each cultivar.
It was concluded that, in grapevines, TDF measurements do not lead to the direct assessment of vine water status and therefore may not be best suited for the development of irrigation scheduling procedures.
Authors
A. Montoro, R. López Urrea, F. Mañas, P. López Fuster, E. Fereres
Keywords
dendrometer, LVDT sensor, trunk shrinkage, regulated deficit irrigation, grapevine
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