Table 8: Variance component for ethanol, cellulose, hemicellulose and lignin content among and within four population sources of switchgrass based on half-sib progeny performance evaluated under 1-cut system at Knoxville, TN (2010-2011).

Sources of variation ETHPKDM Cellulose Hemi Lignin
------------------------- Test of fixed effect --------------------------
Year ** ** ** **
---------Estimated of variance components -------------------------
Source 3.73 0.13 0.04 0
Among HS progenies (HS) 7.47** 0.30** 0.21* 0
Source × year 0.00 0.02 0.00 0
HS × year 0.00 0.01 0.06 0.12*
Within HS 57.73** 3.82** 3.47 2.50**
Mean
Range HS progeny mean 250-266 39.5-42.3 34.5-38.5 9.2-11.4
Range HS progeny mean 231-274 36.2-45.2 30.9-41.4 5.7-13.4
Heritability 0.26 0.40 0.26 0.400

*Significant at 0.05 probability level; **Significant at 0.01 probability level.