Articles
SAP FLOW MEASUREMENT COMPARED TO PENMAN-MONTEITH AND PRIESTLEY-TAYLOR FORMULAS IN OLIVE ORCHARDS (OLEA EUROPAEA L. ‘CHEMLALI’)
Article number
991_45
Pages
367 – 371
Language
English
Abstract
An experimental study was carried out on irrigated olive trees (Chemlali) growing in the arid climate of Gafsa (Tunisia), aiming to estimate the irrigation water requirements of olive trees for a possible optimization of irrigation.
To achieve this objective, sap flow was estimated for whole trees using the heat dissipation method.
Transpiration (T) was estimated by the Penman-Monteith and Priestley-Taylor formulas.
Results show that sap flow depends essentially on solar radiation (with R2=0.857). This study showed a good correlation between the xylem sap flow and climatic parameters (air temperature, solar radiation, vapor pressure deficit). We also found a good regression between sap flow measured by the heat dissipation method and transpiration calculated by Penman-Monteith equation (PM) (R2=0.886) and by Priestley-Taylor equation (R2=0.883).
To achieve this objective, sap flow was estimated for whole trees using the heat dissipation method.
Transpiration (T) was estimated by the Penman-Monteith and Priestley-Taylor formulas.
Results show that sap flow depends essentially on solar radiation (with R2=0.857). This study showed a good correlation between the xylem sap flow and climatic parameters (air temperature, solar radiation, vapor pressure deficit). We also found a good regression between sap flow measured by the heat dissipation method and transpiration calculated by Penman-Monteith equation (PM) (R2=0.886) and by Priestley-Taylor equation (R2=0.883).
Publication
Authors
A. Bchir, O. Boussadia, R. Lemeur, M. Braham
Keywords
olive trees, sap flow, transpiration, water need, optimizing irrigation
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