22
ERDC/CRREL SR-02-2
Table 2. Percent stand at Fort Carson evaluation plots in 1998.
% Stand
Turkey Creek
South Boundary
Introduced species
Crested wheatgrass
95
78
Intermediate wheatgrass
32
Russian wildrye
48
65
Siberian wheatgrass
85
81
Native species
Squirreltail
31
Sand lovegrass
31
Blue grama
0
0
Slender wheatgrass
71
Thickspike wheatgrass
54
26
Western wheatgrass
54
55
Indian ricegrass
19
Needle and thread grass
5
Sideoats grama
0
Table 3. Mean values of desired traits for SERDP-select germplasm compared to the original
populations.
Seedling
Total seedling
Seed weight
Total seed yield
emergence
emergence (mean)
(mean g/50 seeds)
(mean g/plant)
rate/day (mean)
Original
Selected
Original
Selected
Selected
Original
Selected
Original
Bluebunch
1.24
2.58
0.30
5.91
8.32
wheatgrass
0.23
Western
2.3
3.9
31.6
52.9
wheatgrass
Snake River
2.3
3.9
11.75
16.25
wheatgrass
Basin
0.85
1.32
wildrye
The SERDP-select Basin wildrye was collected near Yakima, Washington.
Historically this species is known for its poor seed germination and seedling
vigor. Two cycles of selection for improved seed germination and seedling vigor
resulted in significant increases to both traits (see Table 3). We expect to release
a Selected Class Germplasm in 2004.
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