||Interest in switchgrass (Panicum virgatum) as a feedstock for biofuels
and other bio‐products continues to grow. Tennessee has approximately
5100 planted acres of ‘Alamo’ switchgrass for those intended purposes.
As the bioenergy industry grows there will be increased demand for
higher yielding and better quality varieties. Recently, new varieties
and experimental lines have been produced from breeding programs in
GA and OK. The objective of this research is to compare the yields
of some new varieties and experimental lines with older varieties.
Nine lowland ecotypes: ‘Alamo’ (USDA-TX), ‘Alamo’ (Bammert Seed, TX),
‘Kanlow’, ‘Cimarron’(OSU), OK NSL-2001-1 (OSU), Blade EG 1101(GA993),
Blade EG 1102 (GA 992), C75, C77 (Noble Foundation, OK) and three
upland ecotypes: ‘Blackwell’, Hoop House’, and C62 were planted at
the East Tennessee Research and Education Center (ETREC) in Knoxville.
Eight of the twelve (Blade varieties, USDA source of Alamo, Hoop House
were excluded) were also planted at the Highland Rim Research and Education Center (HRREC) at Springfield, TN. The tests at both locations were seeded in late May, 2007. The experiments were conducted in a randomized complete block design with three replications at both location in plot sizes of 4 ft x 25 ft (ETREC)or 5 ft x 30 ft (HRREC). Plots were harvested according to a one‐cut system in November, 2007‐2009. Results indicate that some of the new varieties and experimental lines are higher yielding than Alamo and Kanlow. Furthermore, the lowland ecotypes are higher yielding than the
uplands, as reported previously by other researchers.