United States Department of Transportation
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Final Report: Clear Recovery Zone Vegetation Requirements, and Review of Current Tree Pruning and Maintenance Practices for Landscape, Urban, and Rural Areas within the Right of Way
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2020-05-13
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[PDF-1.82 MB]
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Edition:April 26, 2017 to May 31, 2020
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Abstract:Though not its primary mission, the Florida Department of Transportation (FDOT) is one of the most significant tree planting organizations in the state. This research investigates the effectiveness of their existing contracts and tree planting management efforts. In an assessment of 2711 planted trees and palms, the authors found that 98.5% survived the transplanting process. Onsite irrigation (as compared to truck watering) generally did not impact tree survival. In contrast tree visual health ratings did detect a significant benefit associated with dedicated irrigation systems. Additionally, this research found that mower damage (the most common source of mechanical damage to the trees assessed) could be reduced if staking materials and mulch were used and if trees were spaced closely together (prohibiting the use of large, pull-behind mowers). Results of this research are incorporated into an associate tree and shrub maintenance guide created for all FDOT landscape trees and palms.
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