Document Type : Research Article
Authors
Department of Horticultural Science and Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
Abstract
Boron toxicity is one of the most important disorders for plant cultivation in the arid and semi-arid regions. Boron accumulation usually occurs in deeper soil layers due to leaching and therefore improvement of such a soil in this situation is difficult. An experiment was conducted to find out the effect of boron on the vegetative and physiological aspects of olive trees. Six concentrations of boron (0.2, 10, 20, 30, 40 and 50 mg/l) and two cultivars (Amygdalia and Konsevolia) were used in this experiment. The experiment was arranged in a completely randomized design with four replications. The results showed that with increasing levels of boron dry weight of leaves, stems and roots compared with controls in both cultivars declined. Amygdalia cultivar in the high concentration of boron was unable to grow and decrease in the production of new leaves was significant but Konsevolia cultivar high concentrations of boron also could grow, although the growth of this cultivar was as well significantly reduced. Efficiency of photosynthesis (Fv/Fm) in both cultivars decreased with increasing boron levels. However, Amygdalolia showed a more reduction than Konservolia. Boron toxicity symptoms appeared 45 days after the start of the experiment in concentrations (30, 40 and 50 mg/l) in Amygdalolia cultivar. However, 75 days after the Amygdaloia cultivar symptoms were observed at concentrations 40 and 50 mg/l. The results showed that olive can have a good resistance to boron toxicity, although much of this resistance is largely dependent on the cultivar.
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