The
improved biomass yields were from increased plant heights and
stem diameters in the hybrids.Biomass HP heterosis values ranging
from 38% to 199% have also been reported in other studies of sweet
sorghum hybrids (Corn, 2008;Meshrametal.,2005). In hybrids
produced with biomass or sweet sorghum plant in troductions and
grain sorghum seed parents ,an average biomass HP heterosis of
38% was seen(Godoy andTesso,2013). These studies also noted the
importance of specific combining ability,as not all of their hybrid
combinations exhibited positive HP heterosis values for biomass
yield. In addition,all of these heterosis studies used parental lines
that are primarily photoperiod-insensitive and flower in long day
environments.