ISHS Acta Horticulturae 493: I ISHS Workshop on Water Relations of Grapevines
PREDAWN LEAF WATER POTENTIAL AND SOIL WATER CONTENT IN VERTICAL TRELLIS UNDER IRRIGATED AND NON-IRRIGATED CONDITIONS IN TEMPRANILLO GRAPEVINES |
| Authors: | J. Yuste, J.A. Rubio, H.J. Peláez, C. Ruiz, J.R. Lissarrague |
| Abstract:
The relationship between soil water content and predawn water potential for cv. Tempranillo grapevines cultivated under non-irrigated and irrigated conditions during 4 years (1994–1997) have been investigated. The vines were 7 years old in 1994. Soil water content was measured by the TDR technique up to the depths of 0.15, 0.30, 0.60 and 1.00 m. Predawn leaf water potential was measured throughout the vegetative cycle of the vine. Soil water content decreased throughout the year with the major drop occurring from flowering to veraison and reaching the lowest values of about 9 % at harvest. No significant differences in soil water content between non-irrigated and irrigated plots have been observed. Water content of the 0.3–0.6 m horizon showed a similar evolution and level as the whole profile. Therefore, the measurement of the 0.3–0.6 m horizon provides a good estimate of the whole profile. Predawn leaf water potential decreased throughout the season being higher in the irrigated vines compared to the non-irrigated ones from before veraison until harvest. Predawn leaf water potential increased rapidly with soil water content, but it stayed approximately constant to higher content than 12 %. Predawn leaf water potential resulted to be linearly related to soil matrix potential since with decreasing values of soil matrix potential, predawn leaf water potential decreased as well. | |
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