Primary Report on the Propagation Experiment of Catalpa bungei by Twig Cutting

[Objective] The aim was to supply foundation for promoting the exploitation and popularization of Catalpa bungei.[Method] Four factors such as hormone kinds,cutting medium,hormone concn.and treatment time were used to conduct the seedling-raising experiment of C.bungei by twig cutting so as to discuss the main factors affecting its rooting.[Result] With perlite as cutting medium, the rooting effect was best,with rooting rate of 17.77%.The rooting effect of treating by 500 mg/kg ABT1 rooting powder was better,with rooting rate of 11.93%.The treatment time of 120 min was good,with rooting rate of 14.17%.The effect of cutting medium on rooting was biggest and the secondary were treatment time and hormone concn.The average rooting rates of treatments of 3 hormones at various concn.in order were IBA ABT1 rooting powder NAA and the rooting rate reduced along with the increment of concn.Compared with CK,the rooting rates of C.bungei cuttings treated by ABT1 rooting powder and 500 mg/kg IBA for 2 h were increased 82.6% and 87.4% resp.[Conclusion] With perlite as cutting medium,the rooting effect of treating tender C.bungei cutting by 500 mg/kg ABT1 rooting powder for 2 h was best,with rooting rate of 30.8%.