Effect of winter spray of volck oil on photosynthesis, gas exchange and physiological traits of two olive cultivars

Document Type : Original Article

Authors

1 MS.C. Student of Horticultural Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

3 Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

10.30466/rip.2021.53579.1179

Abstract

This study was conducted to investigate the effect of winter foliar application of volck oil (0, 1, 3 and 5%) on photosynthesis, gas exchanges and physiological index of two olive cultivars (Manzanilla and Khediri) as split plot based on randomized complete block design with four replications during 2018-2019 under Ahvaz climatic conditions. The results showed that the application of 5% volck oil reduced photosynthesis in Khediri and Manzanilla cultivars by 40 and 52.4% compared to the control treatment in the second week after spraying, and then photosynthesis increased. In the Khediri and Manzanilla cultivars, the application of all three concentrations of volck oil increased transpiration rate compared to the control. The stomatal conductance in the Khediri cultivar was higher than Manzanilla, and the highest stomatal conductance was observed 45 days after treatment. The lowest and highest leaf temperatures were recorded in the control and 3% of volck oil treatment, with an average of 29.34 and 32.17 °C, respectively. In both cultivars, radiation use efficiency decreased with the use of volck oil and a high percentage of leaf drop (59.05%) was observed in the Manzanilla cultivar. As a result, in order to use high doses of volck oil for olive trees, it should be done more cautiously due to the partial reduction of photosynthesis and increase in leaf temperature in both cultivars and as well as the high rate of leaf drop in the Manzanilla cultivar.

Keywords

References

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Research in Pomology
Volume 7, Issue 1 - Serial Number 1
September 2022
Pages 29-39

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