34
ERDC/CRREL SR-02-2
choice. For control of soil erosion and weeds while allowing general buildup of
diverse native grasses, then the best choice is the core mix plus Russian wildrye.
This study took place in an area that normally receives 38.3 cm (15 inches)
of annual precipitation; the results may be different at a drier location.
Percent Annual & Biennial Weeds
70
60
50
40
30
20
10
0
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
Bozoisky RWR
Tetra-1 RWR
Ft. Carson Mix
RoadCrest CWG
Vavilov SWG
CD-2 CWG
Treatment/Year
Figure 2. Percent annual and biennial weeds in Turkey Creek plots planted with the
standard Fort Carson mix or with a core native mix plus an introduced-grass add-
on (as named on the treatment axis).
Sand dropseed
Percent Nat ive Grasses
Lovegrass
100
Indian Ricegrass
90
Blue grama
80
Side Oats Grama
70
Thickspike Wheatgrass
60
Slender W heatgrass
50
W estern W heatgrass
40
30
20
10
0
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
1999
2000
2001
Bozoisky RWR
Tetra-1 RWR
Ft. Carson Mix
RoadCrest CWG
Vavilov SWG
CD-2 CWG
Treatment/Year
Figure 3. Percent native grasses in Turkey Creek plots planted with the standard
Fort Carson mix or with a core native mix plus an introduced-grass add-on (as
named on the treatment axis).
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