Articles
USE OF SAP FLOW SENSORS TO DETERMINE TRANSPIRATION OF A YOUNG DRIP-IRRIGATED OLIVE ORCHARD (‘ARBEQUINA’) UNDER SEMI-ARID CONDITIONS
Article number
1057_50
Pages
405 – 410
Language
English
Abstract
In drip-irrigated olive orchards, tree transpiration (T) is the most important component of the actual evapotranspiration (ETa) under semi-arid conditions.
For this reason, the determination of T is a very important issue to apply a correct irrigation scheduling.
Thus, the objectives of this study were to determine T, and to evaluate the relations of: i) T and ETa, ii) T and solar radiation (SR), and iii) T and vapor pressure deficit (VPD). A field study was carried out to measure T and ETa of a commercial super intensive hedgerow (5 m between rows and 1.3 m between plants) 3-year-old drip-irrigated olive orchard (Olea europaea L. Arbequina) located in Pencahue valley, Maule Region, Chile (35°23LS; 71°44LW; 96 m a.s.l.). Measurements of T and ETa were done using sap flow (SF) sensors and an eddy correlation system (EC), respectively.
The heat pulse velocity method (HPV) was used to obtain T every 30 min.
The results show that the diurnal trend of T was similar to those of ETa, VPD and SR for most of the study days.
Also, on a daily basis, mean values of T under sunny days were around 2.6 L plant-1 day-1, which represent about 67% of total olive orchard water requirements.
For this reason, the determination of T is a very important issue to apply a correct irrigation scheduling.
Thus, the objectives of this study were to determine T, and to evaluate the relations of: i) T and ETa, ii) T and solar radiation (SR), and iii) T and vapor pressure deficit (VPD). A field study was carried out to measure T and ETa of a commercial super intensive hedgerow (5 m between rows and 1.3 m between plants) 3-year-old drip-irrigated olive orchard (Olea europaea L. Arbequina) located in Pencahue valley, Maule Region, Chile (35°23LS; 71°44LW; 96 m a.s.l.). Measurements of T and ETa were done using sap flow (SF) sensors and an eddy correlation system (EC), respectively.
The heat pulse velocity method (HPV) was used to obtain T every 30 min.
The results show that the diurnal trend of T was similar to those of ETa, VPD and SR for most of the study days.
Also, on a daily basis, mean values of T under sunny days were around 2.6 L plant-1 day-1, which represent about 67% of total olive orchard water requirements.
Publication
Authors
M. Zuñiga, S. Ortega-Farías, C. Poblete-Echeverría
Keywords
irrigation scheduling, heat pulse velocity, eddy covariance system
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