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Low soil temperatures induce water deficits in olive (Olea europaea) trees by E. W. Pavel; E. Fereres is a Agricultural and Biological Sciences article available to read on EtoBox.

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Olive trees are often subjected to low temperatures during winter. To quantify the effects of low temperatures on the water relations of olive trees, we studied the responses to low soil temperatures on winter days of variable evaporative demand (ET~0~) in 1‐year‐old potted olive (__Oleo europaea__ L. cv. Picual) trees in 1996 and 1997. Low night (2.5 and 5.2°C) but ambient day soil temperatures (above 10°C) did not affect stomatal conductance (g~s~), leaf (Ψ~leaf~) and stem (Ψ~stem~) water potentials. Soil temperature levels inducing water stress in olive trees were determined for winter days with ET~0~ typical for southern Spain (ET~0~= 1.5 ± 0.3 mm day^−1^). Leaf and stem water potential decreased and root hydraulic resistance (r~root~) increased when trees were exposed to night and day soil temperatures below 10°C. Stomatal conductance was not affected at soil temperatures between 6.4 and 10°C, but decreased at temperatures below 6.4°C. The soil temperature levels affecting the water uptake of olive trees remained relatively constant over the range of ET~0~ of 1‐2 mm day^−1^ during winter and early spring months. However, the soil temperature influencing gs appeared to be more

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Author

E. W. Pavel; E. Fereres

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

1998

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)