ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
THE RELATIONS BETWEEN TRUNK DIAMETER FLUCTUATIONS AND TREE WATER STATUS IN OLIVE TREES (Olea europea L.) |
| Authors: | A. Moriana, E. Fereres, F. Orgaz, J. Castro, M.D. Humanes, M. Pastor |
| Keywords: | Olive, Olea europea L, trunk diameter fluctuations, maximum daily shrinkage, stem water potential. |
| Abstract:
The seasonal evolution of maximum daily shrinkage (MDS) of olive tree trunks was characterised in an orchard where differences in water status were imposed by differential irrigation and with time of the year. The MDS-Stem Water Potential (ψ) relationship showed two different phases. Under conditions of mild water stress, a linear relationship between these two parameters was found with a high rate of increase in MDS values as Y decreased. At about -1.5 MPa ψ, the relationship changed and a further reduction in ψ was associated with a decrease in MDS. In the period of recovered, the MDS values were less than the previously measured at the same level of ψ The hysteresis in the ψ-MDS relationship could be an effect of the stomata behaviour. | |
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