تأثير منظم النمو IBA والوسط الزراعي في إكثار نبات ورد الجمال Hibiscus rosa - sinensis L. باستخذام العقل الساقية

Abstract

This experiment was carried out in the green house of Department of Horticulture and Landscape Gardening, College of Agriculture, University of Anbar for the period from 1/3/2018 to 1/11/2018 to study the effect of growth regulator (IBA) at the concentrations 0, 1500, 3000 and 4500 mg. L-1 and the agricultural media of sand, sand + peatmoss 2:1 and sand + poultry litter 3% propagate cuttings of Hibiscus rosa-sinensis L. by using hard wood stem cuttings, the experiment was laid cut in Complete randomized design (4x3). It included 12 experimental units with three replicates of 20 cuttings in each experimental unit, means were compared using L.S.D test at 5% probability. The results showed that immersion cuttings in IBA achieved a significant increase in rooting ratios and a superior concentration of 4500 mg. L-1, giving the highest rooting rate of 90.00%, while control treatment recorded the lowest rate of 36.67%. Furthermore 4500 mg. L-1 recorded significant increases for all characteristics including: length of the longest root, and root dry weight, number and diameter of branches, vegetative dry weight parts, total chlorophyll in leaves, and content of branches of carbohydrates and nitrogen, and ratio C/N Reached, 43.89 cm. root-1, 38.98 g.root-1, 2.96 branch. Transplant-1, 5.99 mm.branch-1, 45.07 g.plant-1, 100.99 mg.100g-1 fresh weight, 12.41%, 1.88%, 6.61%, respectively. While, the control treatment gave the lowest value of 27.67 cm.root-1, 9.44 g.root-1, 1.81 branch. Transplant-1, 4.01 mm.branch-1, 60.19 cm. Transplant-1, 10.05 g.plant-1, 69.13mg.100g-1 fresh weight, 11.83%, 1.85%, and 6.41%, respectively. The treatment of the agricultural media (sand + poultry litter 3%) have a significant effect in all the characters compared to the other media (46.17 cm.root-1, 44.26 g.root-1, 3.47 branch. plant-1, 8.36 mm. branch-1, 51.59 g.plant-1, 143.40 mg.100 g-1 fresh weight, 12.79%, 1.89%, and 6.76%) respectively. But, the control treatment gave lowest values of, 26.17 cm.root-1, 11.34 g.root-1, 1.56 branch. Transplant-1, 3.41 mm.branch-1, 12.61 g.plant-1, 53.89 mg.100 g-1 fresh weight, 11.61%, 1.83% and 6.34%, respectively. The interaction showed significantly affected the root and vegetative characters of plants after six months of cultivation. The interaction between of IBA concentration (4500 mg-1) and media (sand + poultry litter 3%) significantly exceeded the other treatments by giving the highest rates of the previous studied characters