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Response of N and P absorption on Broussonetia papyrifera seedlings to inoculate Vesicular-arbuscular mycorrhizal fungus Preparation and Characterization of Self-Emulsifying Styrene Acrylate Emulsion Used as Surface-Treatment Agent for Decorative Base Paper Factors on Absorption of Trees to Imidacloprid Liquid Formulation with Auto Flowing Trunk Injection