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Relationships among Vine- and Soil-Based Measures of Water Status in a Thompson Seedless Vineyard in Response to High-Frequency Drip Irrigation

¹ Department of Viticulture and Enology, University of California, Davis, and Kearney Agricultural Center, 9240 S. Riverbend Ave., Parlier, CA 93648; ² Water Management Research Laboratory, USDA-ARS, Parlier, CA 93648.

^* Corresponding author [Email: williams{at}uckac.edu]

A study was conducted in the field on Vitis vinifera L. (cv. Thompson Seedless) to compare various measurements of vine water status under high-frequency drip irrigation. Water use at 100% of vine evapotranspiration (ET_c), was determined with a weighing lysimeter. Vines in the vineyard were irrigated at 0, 0.2, 0.6, 1.0, or 1.4 times the amount of water used by the lysimeter vines. Water applications occurred each time the lysimeter lost 16 L of water (2 mm depth; 8 L vine^–1). Soil water content (_v) was measured in the 0.2, 0.6, 1.0, and 1.4 irrigation treatments. Predawn (_PD), midday leaf (_l), and midday stem (_stem) water potentials were measured at the ends of the 1991 and 1992 growing seasons and almost monthly during 1993. Soil water content in 1993 remained constant throughout the growing season for the 1.0 irrigation treatment, increased in the 1.4 treatment, and decreased in the 0.2 and 0.6 treatments. Both _l and _stem measurements detected differences among irrigation treatments to a greater extent than did _PD until very late in the 1993 growing season. There was a linear relationship between _l and _stem. All three measurements of water potential were related to soil water content (using a quadratic function); however, the relationship between SWC and _PD had the lowest R² value, 0.52 compared to 0.90 and 0.94 for _l and _stem, respectively. Results indicated that _PD would not be useful in accurately determining vine water status under high-frequency deficit irrigation.

Key words: predawn water potential, midday leaf and stem water potential, soil water content, weighing lysimeter

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