ISHS Acta Horticulturae 449: II International Symposium on Irrigation of Horticultural Crops
CONTROL OF WATER CONSUMPTION BY THE OLIVE TREE |
| Authors: | J.E. Fernández, F. Moreno, I.F. Girón, O.M. Blázquez |
| Keywords: | Olea europaea, irrigation, stomata, leaf water relations |
| Abstract:
Measurements of leaf water potential (  ) and stomatal conductance to H2O (g) were made in 26-year-old Manzanillo olive trees under irrigation and dry-farming conditions.
On days of high water demand, the olive trees reduced water losses by closing the stomata, so preventing excessive water stress.
The analysis of g values versus photosynthetically active radiation (IPAR) and vapour pressure deficit (VPD), showed that stomata were fully opened at relatively low IPARlevels, from about 500 μmol m-2 s-1. Also, g decreased with increasing VPD, for values of up to approximately 4 kPa.
After plotting the relative extractable soil water (REW) values against their counterparts of pre-dawn leaf water potential (pd), it was observed that pd remained constant for values of REW higher than 0.4, with a mean value of -0.46 MPa.
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