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Table S1. Description of locations used for trials of Miscanthus and switchgrass in Illinois. Annual temperature and precipitation are 30-year averages (Angel, 2007). Soil was sampled to 30 cm using a 5-cm-diameter core at each plot at each location (n=4) in March 2003. Mineral concentrations were determined with Mehlich3 extraction (Mehlich, 1984) by the Iowa State University Plant and Soil Analysis Laboratory (Ames, IA).

Table S2. Maintenance inputs to Miscanthus and switchgrass trials established at three locations in Illinois in 2002.

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