©2023 International Society of Arboriculture 104 Scharenbroch et al: Towards an Improved Rapid Urban Site Index RUSI Units 0 1 2 3 HOR cm < 1 1 to 5 6 to 15 > 15 ERAb m2 < 5 5 to 25 26 to 50 > 50 WAS % no aggregates < 50% post soak < 50% post swirl > 50% post swirl SOM IL SOM chart gray chip 1 chip 2 to 3 chip 4 to 5 EC µS cm-1 < 50 or > 3,000 50 to 100 or 2,001 to 3,000 101 to 300 or 1,001 to 2,000 301 to 1,000 pH n/a < 4 or > 9 4 to 4.9 or 8.1 to 9 5 to 5.9 or 6.6 to 8 6 to 6.5 aAdd 1 to the PPT if irrigation is present within 3 m of the tree. bAdd 1 to the ERA score if a breakout zone of at least 50 m2 is present within 2 m of the main stem of the tree. Literature Cited Alexander JD. 1971. Color chart for estimating organic carbon in mineral soils in Illinois. Champaign (IL, USA): University of Illinois Extension. AG-1941. https://pubsplus.illinois.edu/products/color-chart-for-estimating-organic-matter-in-mineral-soils-in-illinois Bond J. 2012. Urban tree health: A practical and precise estimation method. Geneva (NY, USA): Urban Forest Analytics LLC. 128 p. Davey Resource Group. 2010. Urban forest management plan, Stevens Point, Wisconsin. Kent (OH, USA): Davey Resource Group. https:// stevenspoint.com/DocumentCenter/View/855/Urban-Forest-Managment-Plan Freberg M. 2016. City of Green Bay Tree Inventory. Personal Communication. Growing Degree Days. 2014. Omaha (NE, USA): iNet Solutions Group. [Accessed 2017 June 5]. https://www.gddapp.com i-Tree. 2008. i-Tree Ecosystem Analysis: Milwaukee. Urban Forest Effects and Values. https://www.itreetools.org/documents/327/Milwaukee %20Ecosystem%20Analysis.pdf Nimmo JR, Perkins KS. 2002. Aggregate stability and size distribution. In: Dane JH, Topp CG, editors. Methods of soil analysis, Part 4: Physical methods. Madison (WI, USA): Soil Science Society of America. p. 317-328. Scharenbroch BC, Carter D, Bialecki M, Fahey R, Scheberl L, Catania M, Roman LA, Bassuk N, Harper RW, Werner L, Siewert A, Miller S, Hutyra L, Raciti S. 2017. A rapid urban site index for assessing the quality of street tree planting sites. Urban Forestry & Urban Greening. 27:279-286. https://doi.org/10.1016/j.ufug.2017.08.017 Scharenbroch BC, Catania M. 2012. Soil quality attributes as indicators of urban tree performance. Arboriculture & Urban Forestry. 38(5): 214-228. https://doi.org/10.48044/jauf.2012.030 Scharenbroch BC, Watson GW. 2014. Wood chips and compost improve soil quality and increase growth of Acer rubrum and Betula nigra in compacted urban soil. Arboriculture & Urban Forestry. 40(6):319-331. https://doi.org/10.48044/jauf.2014.030 Schoeneberger PJ, Wysocki DA, Benham EC, Soil Survey Staff. 2012. Field book for describing and sampling soils, version 3.0. Lincoln (NE, USA): USDA Natural Resources Conservation Service, National Soil Survey Center. https://www.nrcs.usda.gov/sites/default/files/ 2022-09/field-book.pdf US Census Bureau. 2017. Population. [Accessed 2017 January 14]. http://www.census.gov/topics/population.html US Climate Data. 2014. [Accessed 2014 January 6]. http://www.usclimatedata.com USDA NRCS. 1971. Soil survey of Milwaukee County, Wisconsin. Washington (DC, USA): USDA Natural Resources Conservation Service. USDA NRCS. 1974. Soil survey of Brown County, Wisconsin. Washington (DC, USA): USDA Natural Resources Conservation Service. USDA NRCS. 1978. Soil survey of Portage County, Wisconsin. Washington (DC, USA): USDA Natural Resources Conservation Service. Webster BL. 1979. Guide to judging the condition of a shade tree. Journal of Arboriculture. 4(11):247-249. https://doi.org/10.48044/ jauf.1978.061 Table S4. continued
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