260 Werner and Jull: Fertilizer Uptake, Partitioning, and Recovery in Container-Grown Trees if an equivalent amount of N applied over multiple applications using low doses of N or slow release fertilizers would yield similar results. The combination of a plethora of tree species found in urban landscapes, the myriad of soil and climatic con- ditions, and a wide range of management objectives have made attempts to generalize fertilizer recommendations difficult. It is essential that future studies utilize a wider array of tree species, fertilizer formulations, and treatment levels, as well as incorpo- rate repeated applications within a growing season under a va- riety of site conditions to build upon the results from this study. Acknowledgments. This research was funded by the International Society of Arboriculture’s TREE Fund, the Wis- consin Arborist Association, and a Uni- versity of Wisconsin System Consor- tium grant. Use of trade names in this publication does not imply endorse- ment by the University of Wisconsin- Madison of products named, nor criti- cism of similar ones not mentioned. Technical assistance of Drs. Brian Yandell and Jun Zhu, Mr. William Schmitt, Armand Krueger, and Peter Crump is gratefully acknowledged. Special consideration is given to The Morton Arboretum, Lisle, IL and Dr. Gary Watson for providing a re- search location and staff and the Root Control, Inc. for their donation of planting bags. From a dissertation submitted by L.P. Werner in partial fulfillment of the requirements for the Ph.D. degree. LITERATURE CITED Aerts, R. 1996. Nutrient resorption from senescing leaves of perennials: Are there general patterns? Ecology 84:597–608. Ågren G.I., and O. Franklin. 2003. Root: shoot ratios, optimization and nitrogen productivity. Annals of Botany 92:795–800. American National Standards Institute (ANSI). 2004. 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