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The Laws of Branching and Trunk Extension Sprouted from Lateral Buds in Paulownia trees Effects of Pruning to Promote Trunk Extension on Annual Growth Dynamic of Paulownia Branches Pruning Technique and Its Effects on Paulownia Trunk Extension Study on Effects of Pruning to Promote Trunk Extension onPhotosynthetic Characteristics of Paulownia THE ADVANCES OF PAULOWNIA STEM FORM CULTIVATION RESEARCH