Arboriculture & Urban Forestry 40(6): November 2014 found in temperate forest soils. Future research must also consider the impacts of these organic materials on tree health, which does not necessar- ily have a positive linear relationship to tree growth. Acknowledgments. Funding for this research was provided by the Tree Research and Education Endowment (TREE) Fund Hyland R. Johns grant (07-HJ-01) and The Morton Arbo- retum Endowment. The trees in this research were donated by J. Frank Schmidt & Sons. We acknowledge and thank Research Assistants (Michelle Catania, Angela Hewitt, Marvin Lo and Doug Johnston) and also the many volunteers and student interns in The Morton Arboretum Soil Science Laboratory and Root Biology Laboratory for their work on this research. LITERATURE CITED American National Standards Institute (ANSI). 2004. American National Standard for Tree Care Operations – Tree, Shrub, and Other Woody Plant Maintenance – Standard Practices (Fertil- ization) (A300, Part 2). 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National Organic Standards Board (NOSB). 2002. Compost Task Force Recommendation. 09/04/2010. Nelson, D.W., and L.E. Sommers. 1996. Total carbon, organic carbon, and organic matter. In: D.L. Sparks et al. (Eds.). Methods of Soil Analysis. Part 3. Chemical Methods. Soil Science Society of America. Madison, Wisconsin. pp. 961–1010. Olsen, S.R., and L.E. Sommers. 1982. Phosphorus. In: A.L. Page et al. (Eds.). Methods of Soil Analysis Part 2. Soil Science Society of America. Madison, Wisconsin. pp. 403–430. Organic Fertilizer and Cover Crop Calculator. 2014. Accessed 02/07/2014. Parkin, T.B., J.W. Doran, and E. Franco-Viscaino. 1996. Field and laboratory tests of soil respiration. Potentially mineralizable nitrogen as an indicator of biologically active soil nitrogen. In: Doran, J.W., and A.J. Jones (Eds.). Methods for Assessing Soil Quality. Soil Science Society of America, no. 49. Madison, Wisconsin. pp. 231–246. Percival, G.C., and S. Barnes. 2005. The influence of calcium and nitrogen fertilization on the freezing and salinity tolerance of two urban tree species. Journal of Arboriculture 31:10–20. ©2014 International Society of Arboriculture
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