Effect of 2,4-Dichlorophenoxyacetic Acid and NPK fertilizer on the growth and bulb production two cultivars of freesia (Freesia hybrid L.) under-Kurdistan climate

This study was conducted for the period from 1st February to 1st July 2024 in the Nursery of DohukUniversity to evaluate the best responding of two cultivars (Red, and Pink) to three concentration of 2,4-D (0, 200, 400) mg L-1of and NPK fertilizer (0, 150, 300) mg L-1 Under the agro-climatic conditions ofKurdistan. The best results include. The best response was for pink cultivar that significantly superiorthan red cultivars in most of the studied parameters. Spray the plant with 400 mg L-12,4-D increasedsuperiorly the plant height (31.14) cm, growth index (923.8) cm3, vase life (7.14) days, bulb number/plant (6.33), bulbs weight /plant (11.76) gm, bulb size per plant (13.78), whereas spray the plant with200 mg L-12,4-D increased the bulbet size/plant which reached to (7.22). Increased NPK fertilizer from0 to 300 mg L-1increased significantly the height of plant from 25.65 to 32.75 cm, growth index from576.7 to 1057.2 cm3, Vase life from 6.64 to 7.47 days, bulb number/plant from 5.28 to 6.22, bulbetnumber/plant from 6.72 to 9.33, bulb weight/ plant 9.15 to 14.34 gm, bulbet weight/plant from 4.09 to6.40 gm, bulb size/plant from 10.81 to 14.17, bulbet size/plant from 5.58 to 8.22. The treatment thatresulted in the highest significant values for most of the studied parameters was the combination of thepink cultivar with 400 mg L-1of 2,4-D and 300 mg L-1of NPK.