Arboriculture & Urban Forestry 43(1): January 2017 secutive years had no ill effects, even on mature aging oak trees. That being said, such a high rate still may not be wise given that it is up to 10 times greater than natural nutrient recycling in the for- est, even without additional lawn fertilization. If the trees are not taking up the additional nitrogen, then it may be leaching through the soil and into the surrounding environment, which is a concern. Fertilization of urban landscape trees may be appropriate in certain situations, but fertilization practices should be based on the condition and age of the tree, deficiency symptoms, nutrient analysis, and site conditions (ANSI 2011; Smiley et al. 2013). This work adds to the support for fertilization practices based on assessment of the tree and site conditions to avoid ineffective and unnecessary fertilization. Acknowledgments. 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