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Switchgrass Biomass and Chemical Composition for Biofuel in Eastern Canada

^a Dep. of Plant Science, McGill Univ., 21-111 Lakeshore Rd., Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
^b Agric. & Agri-Food Canada, 107 Science Place, Saskatoon, SK S7N 0X2. Canada

View larger version (41K): [in a new window]   Fig. 1 Mean maximum and minimum temperatures, and total rainfall for 1995 and 1996 at the Emile A. Lods Research Centre, Montreal, QC

View larger version (18K): [in a new window]   Fig. 2 Dry matter accumulation with time by three switchgrass cultivars during the 1995 and 1996 growing seasons at Montreal, QC: Cave-in-Rock (solid circles), Pathfinder (open circles), and Sunburst (solid triangles). The dotted curves were fitted by regression using the combined data set. Regression equations fitted for each cultivar and the combined data are given in Table 1. Bars extending beyond symbols denote standard error

View larger version (26K): [in a new window]   Fig. 3 Mean tiller numbers of Cave-in-Rock, Pathfinder, and Sunburst switchgrass at three sampling dates at Montreal, QC: 7 July (white), 21 July (hatched), and 3 August (black). Each bar is an average of three blocks and two years for each cultivar. Error bars denote standard error

View larger version (20K): [in a new window]   Fig. 4 Canopy heights of three switchgrass cultivars during the 1995 and 1996 growing seasons at Montreal, QC: Cave-in-Rock (solid circles), Pathfinder (open circles), and Sunburst (solid triangles). Regression equations fitted for each cultivar and the combined data for 1996 are given in Table 2. Regression analyses of height on time did not yield acceptable equations for the 1995 data. Bars extending beyond symbols denote standard error

View larger version (19K): [in a new window]   Fig. 5 Relationship between dry matter accumulation and canopy height for three switchgrass cultivars during the 1995 and 1996 growing seasons at Montreal, QC: Cave-in-Rock (solid circles), Pathfinder (open circles), and Sunburst (solid triangles). The dotted curves were fitted by regression using the combined data set (pooled over cultivars). Regression equations fitted for each cultivar and the combined data are given in Table 1. Bars extending beyond symbols denote standard error

View larger version (20K): [in a new window]   Fig. 6 Concentration of acid-detergent fiber, neutral-detergent fiber, and N in three switchgrass cultivars grown at Montreal, QC: Cave-in-Rock (solid circles), Pathfinder (open circles), and Sunburst (solid triangles). Each point is an average of two years, 1995 and 1996. Fitted regression equations to the changes in chemical composition with time are given in Table 3. Bars extending beyond symbols denote standard error

View larger version (18K): [in a new window]   Fig. 7 Changes in leaf to stem ratios of three switchgrass cultivars grown at Montreal, QC: Cave-in-Rock (solid circles), Pathfinder (open circles), and Sunburst (solid triangles). Each point is an average of two years, 1995 and 1996. Regression equations fitted for each cultivar and the combined data are given in Table 2. Bars extending beyond symbols denote SE