ROUSSEAUX Maria Cecilia
congresos y reuniones científicas
Daily dynamics of fruit and leaf temperature in five olive oil cultivars.
IGLESIAS, MARÍA AGUSTINA; ROUSSEAUX, M. CECILIA; SEARLES, PETER S.
Congreso; Olivebioteq. 6th International Conference on olive tree and olive products; 2018
Fruit growth and development are regulated by microclimatic conditions within the canopy. However, despite itspotential importance, the dynamics of fruit temperature have largely been unexplored in olive orchards. Theobjectives of this study were to evaluate the daily dynamics of fruit and leaf temperature relative to air temperature infive olive oil cultivars with different fruit sizes. A field trial was conducted during the summer of 2018 with 5-year-oldtrees of cvs. Arbequina, Arbosana, Coratina, Picual and Hojiblanca under full irrigation. Thermal images of fruit andleaves were obtained with an infrared camera during the daylight hours on four days, and temperatures fromthermocouples inserted into fruit were recorded hourly for several weeks. Air temperature was also measuredbetween the trees with a thermocouple protected by a solar radiation shield. Fruit temperature of sunlit fruit wasseveral degrees higher than air temperature in large-fruited cultivars like ?Picual? and ?Hojiblanca?, while fruittemperature was more similar to air temperature in small fruited-cultivars like ?Arbequina? or ?Arbosana?. In contrastto fruit temperature, leaf temperature was almost always lower than air temperature. Under windy conditions, whichwere common in the afternoon, fruit temperature was often not greater than air temperature. The results indicate thatfruit of different olive cultivars experience different temperature regimes based on their size. Implications of thisphenomenon should be determined for oil production, which is temperature dependent, and for global warmingconditions.