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Aim: To evaluate the usability of various plant water potentials in table grape irrigation management under a semiarid climate.Methods and results: Two water regimes were set up. The « control » water regime was the one usually used in the vineyard. The « 50 % Irrigation » water regime delivered only half the quantity of water to the vines. Predawn leaf (ψ L PD), predawn stem (ψ S PD), midday leaf (ψ L M), and midday stem (ψ S M) water potentials were measured during the growing season. The results show that the four water potentials can accurately measure the vine water status in table grape vineyard at a daily and seasonal time scale. But, ψ L M appeared to be the most reliable indicator to differentiate between the two water regimes with a frequency of 73 %. The « 50 % Irrigation » water regime induced in the ‘Italia’ cultivar an anisohydric behavior and a decrease of 29.4 % in vine vigor and 11.5 % in berry weight. Under the Tunisian climate, ‘Italia’ cultivar may exhibit night time transpiration that decreases ψ L PD by 19.5 %.Conclusion: Preliminary minimum ψ L M threshold to produce high quality table grape would be -0.8 and -1.1 MPa for pre- and post-veraison, respectively.Significance and impact of the study: The pressure chamber is an effective device for irrigation management in commercial table grape vineyards under semiarid conditions.

The use of water potentials in irrigation management of table grape grown under semiarid climate in Tunisia