Table 7: Effect of harvest date (first and second harvests) and cultivar on biomass yield of switchgrass grown at eight locations across upper southeast USA under two-cuts (high input and management). Data are averaged across 2 years (CIR: Cave-in-Rock).

HarvestCultivarLocation1Mean
KYNCTN1TN2VA1VA2VA3WV

(Mg/ha)
June (first)Alamo7.18.97.710.46.89.37.87.78.22.1
Kanlow8.38.79.09.88.510.39.19.49.12.0
CIR8.28.910.711.79.310.79.710.710.02.1
Shelter6.37.68.010.48.910.08.610.08.71.9
Mean7.58.58.810.68.310.18.89.49.01.7
1.20.82.71.00.81.21.00.60.5
November (second)Alamo9.04.35.77.07.911.89.96.47.82.4
Kanlow6.93.74.64.77.810.37.75.26.42.4
CIR5.34.64.95.26.67.97.95.36.01.8
Shelter4.73.73.34.36.17.76.14.55.11.4
Mean6.54.14.65.37.19.47.95.46.31.8
1.10.91.40.51.41.41.60.70.5

0.41.41.21.0NS5NSNS1.30.4

Locations: KY (Princeton), NC (Raleigh), TN1 (Jackson), TN2 (Knoxville), VA1,2 (Blacksburg), VA3 (Orange), and WV (Morgantown).
LSD for comparison of cultivars within a harvest and location.
LSD for comparison of locations within a harvest and cultivar.
LSD for comparison of means within a location.
NS: not significant.