Abstract

This investigation was carried out during 2016/2017 to study the effect of extract and powder of Licorice (Glycyrrhizaglabra L.) onProductivityandquality of Onion (Allium cepa L. cv. Bafatiem). The experiment consisted of 7 treatments: spraying licorice extract with three concentrations (5,10,15 g / L) and adding it to the soil at three levels (5,10,15 g / m²) in addition to the control. The results showed that Onion plants that were treated with licorice extract spraying and the addition of powder to soil at all concentrations and levels caused increasing in bulb diameter and height compared with control which was the lowest value in bulb diameter and height. Most of the spraying in addition to treatments, gave bulbs that tended to be round, whereas the control induced bulbs which tended to be oblong (1.07). Spraying and addition to soil treatments of licorice significantly increased bulb weight, compared with the control, which recorded the lowest bulb weight, reaching to 211.29 gm. The bulbs resulting from spraying at 5g/L were the highest values and reaching to 287.44 gm. Onion plants that were treated with licorice extract spraying at 5g/L and the addition to soil at 10 and 15 g/m² significantly increased the yield to 59.68, 53.20 and 54.97 ton/ha. Respectively, compared with all other treatments and control. Total soluble solids (TSS) increased in bulbs, which treated their plants by licorice extract at 5and 15g/L. reaching 12.33% for both.