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Study on Use of Two Kinds of Cultivating Techniques to Control Poplar Canker Effects of Gibberellin and Rooting Powder on the Forcing Culture of Paeonialactiflora ‘Da Fugui’ Effects of Gibberellin and Rooting Powder on the Forcing Culture of Paeonialactiflora ‘Da Fugui’ Studies on the cutting propagation of Taxus chinensis var.mairei.Ⅳ.Effects of rooting powder on the rooting of the cutting Study on Cutting Propagation of Slash Pine×Caribbean Pine Hybrids