The Use of Sap Flow Measurements According to Thermal Dissipation Method for Scheduling Irrigation in Olive Tree
Project no. 973 · Status: Kapanmış · 2016
Summary
This study was carried on olive (cv. Memecik) trees in Bornova Olive Research Institute of the Ministry of Agriculture and Forestry in 2017 and 2018. In this study, changes in 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. In study period average of irrigation water requirement of two years was ranged from 0 to 908 mm and average of ETa varied from 112 to 873 mm. In this study, the mean sap flow values calculated during the 2017 period were 0.054 ml cm-2 min-1for 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 seasonal average of the relative transpiration, which shows the ratio of the sap flow rate of the deficit treatment to the sap flow rate of the control treatment (K2) in olive trees, was found to be 0.59, 1, 0.80, 072 for K1, K2, K3 and K4, respectively. In the second year of study, the mean sap flow values calculated for same period were 0.035, 0.080, 0.069 ve 0.054 for K1, K2, K3 and K4, respectively. And also, the seasonal average of the relative transpiration was found to be 0.44, 1, 0.87, 067 for K1, K2, K3 and K4, respectively. As a result of study; It can be said that the sapflow measurements can be used to determine the response of olive trees to water stress. And also it can be used for irrigation scheduling of olive tree.