Satellite-derived growing season averaged Normalized Difference Vegetation Index (GSN) was
used as a proxy for switchgrass productivity. Multiple regression analyses indicate that there are strong
correlations between site environmental variables and switchgrass productivity (r = 0.95). Sufficient
precipitation and suitable temperature during the growing season (i.e., not too hot or too cold) are
favorable for switchgrass growth. Elevation and soil characteristics (e.g., soil availablewater capacity) are
also an important factor impacting switchgrass productivity