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Biomass Yield and Biofuel Quality of Switchgrass Harvested in Fall or Spring

^a USDA-ARS Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802
^b USDA-ARS, Eastern Regional Research Center, Wyndmoor, PA 19038
^c USDA-ARS, U.S. Dairy Forage Research Center, Madison, WI 53706
^d USDA-ARS, Plant Science Research Unit, 411 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108

View larger version (30K): [in a new window]   Fig. 1. Stem, leaf, and panicle weights of fall 2002 to spring 2004 harvested switchgrass from field-scale blocks at Rock Springs expressed as: (a) % of total tiller weight and (b) component weight of tiller. Vertical bars denote ± SD.

View larger version (53K): [in a new window]   Fig. 2. The components of pyrolysis are total gas, tar, and char. As the temperature of pyrolysis increases, tar and char are broken down to smaller C chemicals and gas. There were no differences in component yields between seasonal time of harvest, so data presented are means of Cave-In-Rock switchgrass samples harvested in fall 2002 to spring 2004 from plot-scale fields. Vertical bars denote ± SD.

View larger version (21K): [in a new window]   Fig. 3. The measured gas components of pyrolysis are CO, CH4, CO2, C2H6, and C3H8. As the temperature of pyrolysis increases, tar and char are broken down to smaller C chemicals and gas. There were no differences in component yields between seasonal time of harvest, so data presented are means of Cave-In-Rock switchgrass samples harvested in fall 2002 to spring 2004 from plot-scale fields. Vertical bars denote ± SD.