ISHS Acta Horticulturae 689: VII International Symposium on Grapevine Physiology and Biotechnology
WATER RELATIONS OF FIELD GROWN DRIP IRRIGATED ´TEMPRANILLO´ GRAPEVINES |
| Authors: | D.S. Intrigliolo, J.R. Castel, D. Pérez |
| Keywords: | soil water content, stem and leaf water potential, stomatal conductance, trunk diameter variations. |
| Abstract:
A field experiment was conducted during 2003 in a Tempranillo vineyard where aspects of water relations were studied under two contrasting situations: a) drip irrigation at 100% of estimated crop evapotranspiration and b) non-irrigated. As expected non-irrigated grapevines had lower leaf and stem water potentials and stomatal conductance during most of the season, in agreement with the evolution of soil water content measured with capacitance probes. All methods of measuring  were significantly correlated with one another.
However, differences between the two treatments were more distinct for stem water potential measurements taken early in the morning due to stomatal closure that occurred at midday.
We also determined the suitability of several indices calculated from trunk diameter variations (TDV) as water stress indicators.
In general, a very distinct behavior for all the TDV calculated indices was observed before and after veraison.
Daily maximum trunk diameter was a good indicator of water stress up to veraison.
Subsequently, trunk growth for both irrigated and non-irrigated vines almost ceased.
Maximum daily shrinkage (MDS) was a poor indicator of vine water status even when corrected for trunk phloem thickness.
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