Impact of Indole Butyric Acid and Paclobutrazol on Rooting of Date Palm (Phoenix dactylifera L.) Off-Shoots Cultivar Zaghloul
Date palm (Phoenix dactylifera L ) cultivar Zaghloul is a commonly fruits in arid and semi arid region. The common method of increasing planting areas of date palm by off-shoots in date palm nursery. Off-shoots are the axillary buds on the trunk of mother palm, is the true to type to the parent palm. Limited numbers of off-shoots (20-30) are produced during juvenile stage (10 – 15) years from date plant. The lowest survival for the transplanting of these off-shoots needs to improve new rooting at the trunk base. Therefore this work was design to increase the survival of transplanting off-shoots by three levels of IBA at 1000, 2000 and 4000 ppm singly and in combination with 0.4 mg/l pbz in the date palm nursery of the Central Laboratory for Research and Development of Date Palm, Agriculture Research Center (ARC).Three categories of off-shoots weights (4, 8 and 12 kg) were subjected to different growth regulators (IBA alone and in combination with 0.4 pbz). The main results of this study were, 72.2% of off-shoots successfully rooted with 4000 ppm IBA furthermore 77.7 and 86.1% successfully rooted with 2000 and 4000 ppm/l IBA + 0.4 mg/l pbz. Using IBA at 4000 ppm/l alone and combined with 0.4 mg/l pbz increased leaf length (cm), numbers of new leaves/ off-shoots, number of new off-shoots/ off-shoots, roots numbers/offshoot and root length (cm). Regard to the treatments of 1000, 2000 and 4000 ppm IBA + 0.4 pbz significantly increased all growth parameters compared to control (tap water). The off-shoots of 12 kg recorded the highest significant rooting 83.3 % treated with 4000 ppm IBA, while 91.7 % resulted for 4000 ppm IBA + 0.4 mg/l pbz treatments with 8 and 12 kg/offshoot. Based on these results, it seemed reasonable to conclude that, treatment with IBA at 4000 ppm/l singly, IBA at 4000 ppm/l in combination with 0.4 mg/l pbz for off-shoots weights 8-12kg/offshoot resulted in the highest rooting percentage of transplanting off-shoots in date palm nursery.