Calibration of Thermal Dissipation Probes for Date Palm (Phoenix dactylifera L.)

The quantification of water flow through the stem is vital for date palm (Phoenix dactylifera L.) to promote a good stress management. thermal dissipation probe (TDP) method developed by Granier widely used evaluate transpiration forest trees; however, there are contradictory reports regarding its reliability. Considerable errors in estimated sap flux density, which might be due lack ofspecies-specific calibrations. TDP uses mathematical model that based on an empirical equation estimate claimed applicable all tree species, independently wood structure and anatomy. At laboratory, we compared rate uptake cut stems with estimates derived from assess validity method.Our calibration results were considerably different Granier’s original equation. Moreover, density was overestimated 18.2 ± 0.5% when parameters Granierare employed. However, using new improved accuracy measurements. Our indicated it not appropriate use general species. Therefore, previous estimations palm’s requirement probes should revised.