The Scientific World Journal

Research Article

Switchgrass Cultivar/Ecotype Selection and Management for Biofuels in the Upper Southeast USA

Table 9

Stand density ratings (0: least dense, 10: most dense) in November 2001 of four switchgrass cultivars grown under two managements at eight locations in upper southeast USA. Plots had been harvested once (in November) and provided 50 kg N/ha/yr or harvested twice (midsummer and November) and provided 100 kg N/ha/yr for 10 years (CIR: Cave-in-Rock).


Cuttings/N	Cultivar	Location¹								Mean
Cuttings/N	Cultivar	KY	NC	TN₁	TN₂	VA₁	VA₂	VA₃	WV	Mean

		Stand Rating (0 to 10)
One/50 kg	Alamo	9.8	6.8	6.2	7.0	4.8	2.9	6.2	8.0	6.4	2.6
	Kanlow	10.0	8.2	8.2	7.5	6.8	3.5	6.6	9.5	7.5	1.9
	CIR	9.5	7.8	8.0	6.5	6.6	4.2	7.1	5.5	6.9	1.6
	Shelter	8.2	6.8	8.2	7.2	7.0	3.9	5.6	6.5	6.6	2.4
	Mean	9.4	7.4	7.7	7.0	6.3	3.6	6.4	7.4	6.9	0.8
		1.1	NS⁵	NS	NS	1.0	NS	NS	2.3	0.6	—
Two/100 kg	Alamo	10.0	9.5	8.8	9.2	9.8	8.6	8.9	10.0	9.4	0.9
	Kanlow	10.0	8.8	9.0	9.8	10.0	9.3	9.6	9.5	9.5	1.2
	CIR	10.0	9.5	9.2	9.5	9.6	8.6	9.2	8.5	9.2	1.0
	Shelter	10.0	9.2	9.5	9.8	9.8	9.1	9.1	9.8	9.5	0.7
	Mean	10.0	9.2	9.1	9.6	9.8	8.9	9.2	9.4	9.4	0.4
		NS	0.5	NS	NS	NS	NS	NS	0.8	NS	—

		0.4	0.7	1.1	1.3	0.4	0.6	0.9	0.9	0.3	—

Locations: KY (Princeton), NC (Raleigh), TN₁ (Jackson), TN₂ (Knoxville), VA_1,2 (Blacksburg), VA₃ (Orange), and WV (Morgantown).
LSD for comparison of cultivars within a management and location.
LSD for comparison of managements within a location.
LSD for comparison of locations within each management and cultivar.
NS: not significant.