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The study was conducted at the Collage of Agricultural Engineering Sciences,University of Sulaimani, Kurdistan Region-Iraq so as to investigate responsehardwood cuttings of Callistemon viminalis to some plant extracts. The hardwoodcuttings were taken on 11 March 2021 and soaked separately in 3 and 6 g/Laqueous extracts of moringa leaf, licorice root, willow shoot, fenugreek seedand cinnamon bark for 1 hour. They were compared to the cuttings dipped in 3000ppm IBA for 10s and control cuttings which were soaked in distilled water for 1hour. The experiment laid out in CRD with three replications in a greenhouse,and each replication included six cuttings which planted in a mixture of sandand rice husk medium. The results showed that the highest (86.66%) rooting wasachieved in the cuttings treated with 6 g/L licorice extract and they weresignificantly different with control cuttings (53.33%), but they were notsignificantly different with 3000 ppm IBA (66.66%). Cinnamon 3g/L and fenugreek3g/L extracts gave the lowest (6.66% and 33.33%, respectively) rooting andother studied parameters. The cuttings dipped in 3000 ppm IBA gave the highest(18.91) root number and the highest (66.66%) survival cuttings aftertransplanting. The longest root (15.54 cm) was found in cuttings were treatedwith 6 g/L moringa extract. The longest (5.83 cm) shoot was observed in treatedcuttings with 3 g/L willow extract. The highest chlorophyll a and b (10.08 and4.62 mg/L, respectively) were observed in cuttings treated with 6 g/L willowextract. Moreover, 3000 ppm IBA gave the highest (20.23%) total carbohydrateand (1.77 mg/g) IAA content along with 6 g/L licorice, moringa and fenugreekextracts, after 30 days from planting of the cuttings. Licorice root extract at6 g/L fairly improved the measurements similar to 3000 ppm IBA throughout thestudy.

Effect of some plant extracts on hardwood cuttings of Bottlebrush (Callistemon viminalis)