Determination of the variation in stomatal conductance and sapflow in olive trees under deficit irrigation

This study was carried on olive (cv. Memecik) trees in Bornova Olive Research Institute of the Ministry of Food, Agriculture and Livestock, in 2017. In this study, changes in stomatal conductance (gs) and sapflow under the deficit irrigation conditions were observed. For this reason, irrigation treatment; K1: non-irrigated (rainfed), K2: soil water deficit in a 90 cm soil depth was refilled to field capacity for every 7 days, K3: application of the 66% of water given at K2, K4: application of the 33% of water given at K2. This study (01/06/2017-30/09/2017), irrigation water requirement was ranged from 0 to 912.3 mm, evaportanspiration (ETa) varied from 90.5 to 850.5 mm. According to the data obtained in this study, the difference between the stomatal sonductance values was statistically significant. The mean stomatal conductance (gs) values calculated for during the period were 293.83 mmol m-2 s-1for K1, 382.62 mmol m-2 s-1 for K2, 371.50 mmol m-2 s-1 for K3 and 293.57 mmol m-2 s-1 for K4. The mean sapflow values calculated during the period were 0.054 ml cm-2 min-1 for K1, 0.091 ml cm-2 min-1 for K2, 0.073 ml cm-2 min-1 for K3 and 0.065 ml cm-2 min-1 for K4. The determination of stomatal conductance (gs) and sapflow measurements can be used to determine the response of olive trees to water stress. In this study, a statistically significant relationship (r2= 0.528) was found between stomatal conductance and sapflow.