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Biomass Production of Switchgrass in Central South Dakota

Plant Science Dep., South Dakota State University, NPB244, Box 2140-C, Brookings, SD 57007

View larger version (44K): [in a new window]   Fig. 1. Pattern of precipitation and cultivar and harvest date effects on biomass production of two switchgrass cultivars for 4 yr at Site 1 on the Dakota Lakes Research Farm in central South Dakota. Means with same letter are not significantly different at the 0.05 level (a: 2001, significant cultivar x harvest date interaction; b: 2002; c: 2003, significant harvest date main effect; d: 2004, significant cultivar x harvest date interaction).

View larger version (33K): [in a new window]   Fig. 2. Pattern of precipitation and cultivar and harvest date effects on biomass production of two switchgrass cultivars for 2 yr at Site 2 on the Dakota Lakes Research Farm in central South Dakota. Means with same letter are not significantly different at the 0.05 level (a: 2003, significant harvest date main effect; b: 2004, significant cultivar x harvest date interaction).

View larger version (22K): [in a new window]   Fig. 3. Relationships between maximum annual biomass production of two switchgrass cultivars and April and May precipitation for 2001 through 2004 at Site 1 on the Dakota Lakes Research Farm in central South Dakota. Each point is the mean of four observations.

View larger version (22K): [in a new window]   Fig. 4. Individual tiller weight (a) and weight of stem (b) and inflorescence (c) fractions of tillers from two switchgrass cultivars (CIR = Cave-In-Rock, DAC = Dacotah) at three harvest dates during 2004 at two sites on the Dakota Lakes Research Farm in central South Dakota.

View larger version (22K): [in a new window]   Fig. 5. Dry matter partitioning coefficients for stem (STPRC, a) and inflorescence (INPRC, b) components of tillers from two switchgrass cultivars (CIR = Cave-In-Rock, DAC = Dacotah) at three harvest dates during 2004 at two sites on the Dakota Lakes Research Farm in central South Dakota.