Articles
EFFECTS OF CANOPY EXPOSURE CHANGES ON PLANT WATER STATUS IN GRAPEVINE CULTIVAR ‘SYRAH’
Article number
889_10
Pages
105 – 111
Language
English
Abstract
An experiment was conducted during the 2006-07 growing season to determine the effects of changes in canopy architecture on plant water status, in an irrigated Syrah vineyard in Mendoza, Argentina.
Changes in canopy architecture were carried out in the Ybm INTA trellis system in which the canopy can be opened or closed generating a single or a double curtain canopy.
The single curtain is similar to a traditional vertical shoot positioning while the double curtain is similar to a Lyre system.
Between bloom and harvest, four treatments were established based on the timing of opening and closing the canopy: i) closed canopies from bloom to harvest; ii) closed from bloom to veraison and opened from veraison to harvest, iii) opened from bloom to veraison and closed from veraison to harvest; and iv) opened from bloom to harvest.
Predawn and midday leaf water potentials were measured over the course of the growing season.
In addition, at key phenological dates, diurnal cycles of leaf water potential measurements were conducted.
Results indicated that increasing canopy exposure to sun light decreased midday leaf water potential, suggesting an increase in the whole vine transpiration.
Differences in canopy exposure led to different daily variations of vine water relations.
Mobile trellis systems might be used as a tool to adapt or manipulate vineyard water requirements according to the environmental and soil water conditions during the season.
Changes in canopy architecture were carried out in the Ybm INTA trellis system in which the canopy can be opened or closed generating a single or a double curtain canopy.
The single curtain is similar to a traditional vertical shoot positioning while the double curtain is similar to a Lyre system.
Between bloom and harvest, four treatments were established based on the timing of opening and closing the canopy: i) closed canopies from bloom to harvest; ii) closed from bloom to veraison and opened from veraison to harvest, iii) opened from bloom to veraison and closed from veraison to harvest; and iv) opened from bloom to harvest.
Predawn and midday leaf water potentials were measured over the course of the growing season.
In addition, at key phenological dates, diurnal cycles of leaf water potential measurements were conducted.
Results indicated that increasing canopy exposure to sun light decreased midday leaf water potential, suggesting an increase in the whole vine transpiration.
Differences in canopy exposure led to different daily variations of vine water relations.
Mobile trellis systems might be used as a tool to adapt or manipulate vineyard water requirements according to the environmental and soil water conditions during the season.
Authors
E. Galat Giorgi, J. Perez Peña, J. Prieto
Keywords
leaf water potential, trellis system, vine growth vine water status, Vitis vinifera
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