Effect of Foliar Spray with Glycyrrihiza Glabra Root Extract and Gibberellic Acid on Onion (Allium cepa L.) Growth under Water Stress Conditions

R. Babilie, B. Abu Trabi, M. Jbour, R. Murshed

Abstract


The experiment was carried in 2012/2013 season to study the effect of foliar spraying treatments with liquorice (Glycyrrihiza glabra) root extract (5 and 10 g/l) and GA3 (50 and 100 ppm), in comparison with distilled water, on growth of Baladi onion at three different levels of irrigation (100, 75, and 50% of field capacity). Onion bulblets were planted in pots and spraying started when plants had 3-4 leaves and repeated every two weeks until plants complete their vegetative growth. Water stress period of 20 days was applied when plants had 6-7 leaves. The results showed that the treatment with liquorice extract and gibberellic acid led to a significant increase in all indicators studied. Reducing the level of irrigation resulted in a significant decrease in plant height, leaf content of chlorophyll, and bulb weight, versus an increase in the concentration of proline, and the percentage of dry matter, and total soluble solids. However, the interaction between foliar spraying and irrigation levels was not significant, with the possibility of using spraying with liquorice extract and gibberellic acid in mitigating the negative impact of lack of water.

Keywords


Onion, Liquorice, Gibberellic Acid, Foliar Spray, Water Stress

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