Table 1: Mean biomass yields for four switchgrass populations based on half-sib progeny performance at the East Tennessee Research and Education Center, Holston Unit, Knoxville, TN, under 1-cut (2010 to 2011) and 2-cut (2012 to 2013).

Population source 1-cut system 2-cut system (seasonal biomass yield) 2-cut system (fall only biomass yield)
2010 2011 Mean 2012 2013 Mean 2012 2013 Mean
-------------------------------------Biomass yield kg plant-1-----------------------------------
ARK 0.56 b 1.52 b 1.04 b 1.89 a 1.39 a 1.64 a 0.87 a 0.28 a 0.58 a
OKN 0.96 a 2.09 a 1.52 a 1.96 a 1.44 a 1.70 a 0.86 a 0.26 a 0.56 a
OKS 0.95 a 2.05 a 1.50 a 2.01 a 1.47 a 1.74 a 0.92 a 0.30 a 0.61 a
TX 1.00 a 2.17 a 1.58 a 2.01 a 1.48 a 1.75 a 0.95 a 0.32 a 0.63 a
Mean 0.87 1.97 1.41 1.97 1.44 1.70 0.90 0.29 0.60
LSD 0.10** 0.21** 0.11** 0.17 0.15 0.11 0.13 ns 0.05 ns 0.07 ns

**Significant at the 0.01 probability level; ns: Not significant; †Values followed by a common letter within a column are not different at 0.05 probability level.