Studies on the cutting propagation of Taxus chinensis var.mairei.Ⅳ.Effects of rooting powder on the rooting of the cutting

Effects of rooting powder on the rooting of the cutting of Taxus chinensis var.mairei were studied.The results show that rooting powder A₃ is the best,the days of first root appearance,rooting rate,number of root,length of root and index of root system for A₃ are 52.7～64.0d,90.0%～93.7%,8.00～8.67,8.67～8.93cm and 0.61～0.69,which are much better than those of the other three types of rooting powder.The second is the rooting powder A2,Gibberellin is the poorest.The experiment of concentration show that no significant difference is observed between various concentrations for A2 and A3 except the concentration of 20ng/kg for A₁.But a significant difference in index of root system is observed between the concentrations of 20ng/kg and 15ng/kg or 20ng/kg and 10ng/kg.The concentration of 20ng/kg is better than the other two concentrations for A₂.It is possible that the increment of the applied concentration of A₁ and A₂ will increase the rooting efficiency.