Fraxinus spp. (ash) trees are widely found in urban areas across the U.S. where they experience varying degrees and types of stress. Fertilizer and paclobutrazol (PB) are marketed as a means to alter growth and enhance tree vigor. Fertilizer typically increases radial growth but may reduce root: shoot ratios. Paclobutrazol, a gibberellin inhibitor, may reduce radial growth but increase root: shoot...
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