32
ERDC/CRREL SR-02-2
Table 5 shows percent of cheatgrass in each plot in 2000. These results show
that plots with Vavilov had lower amounts of cheatgrass. For instance, significant
reductions in cheatgrass occurred when Vavilov was planted in alternating rows
with bluebunch or Snake River wheatgrass as compared with each of those
natives planted alone. In the Vavilov and bluebunch combinations, Vavilov
allowed bluebunch to get established. The next step is to see if Vavilov will
allow bluebunch to persist, especially through drought.
Table 5. Percent cheatgrass in Yakima Training Center plots in 2000 (two
years after establishment).
Row spacing
Grasses
25 cm
35 cm
Mean
Bluebunch wheatgrass
53
65
59
Snake River wheatgrass
35
78
57
Vavilov Siberian wheatgrass
7
30
19
Bluebunch/Snake River mix
57
70
64
Bluebunch/Snake River alternating rows
30
52
41
Bluebunch/Vavilov mix
17
47
32
Bluebunch/Vavilov alternating rows
30
52
41
Snake River/Vavilov mix
25
48
36
Snake River/Vavilov alternating rows
25
48
36
Bluebunch/Snake River/Vavilov mix
16
50
33
Mean
32
56
44
LSD (0.05)
23
19
15
Turkey Creek mixed native and introduced seeding
In the second study, we compared species and varieties when seeding
mixtures of native and introduced grasses at Turkey Creek on Fort Carson,
Colorado. This study was dormant-seeded in the fall of 1997. The treatments
involved a core native-grass mix plus one of five additional introduced grasses.
The core native mix is shown in Table 6; the introduced add-on species were
Bozoisky Russian wildrye, Tetra-1 Russian wildrye, RoadCrest crested wheat-
grass, Vavilov Siberian wheatgrass, and CD-II crested wheatgrass. For compari-
son, the Fort Carson standard mix (see Table 7) was also seeded at increased
rates to match the above treatments. The plots were evaluated in 1999, 2000, and
2001 for species composition, percent ground cover, percent annual and biennial
weeds, percent introduced grasses, and percent natives.
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