Workshop on New Grass Germplasms
33
Table 6. Core native mix plus introduced add-on.
Species
Lb/acre
% of mix
Core native mix
`Barton' western wheatgrass
4
26
`Pryor' slender wheatgrass
2
14
`Nezpar' Indian wheatgrass
1
6
`Vaughan' sideoats grama
1
6
`Critana' thickspike wheatgrass
2
13
Lovegrass
0.5
3
Blue grama
1
6
Introduced grass add-on
4
26
Total
15.5
100
Table 7. Fort Carson standard mix at seeding rate increased to match the
core-mix-plus-add-on treatment.
Species
Lb/acre
`Barton' western wheatgrass
7.9
`Vaughan' sideoats grama
4.4
Alkali sacaton
0.4
Sand dropseed
0.3
`Nordan' crested wheatgrass
1.8
`Ladak' alfalfa
0.7
Total
15.5
Overall, the mixes with the crested or Siberian wheatgrasses had the fewest
weeds (Fig. 2). After three years, the plots with Fort Carson mix and the core mix
with the Russian wildrye add-ons had native grasses predominating, while the
core mix with the crested or Siberian wheatgrass add-ons yielded more intro-
duced grasses. The Fort Carson mix allowed the greatest percentage of natives
after three years, but there was less diversity among the native species than with
the mixes with Russian wildrye (Fig. 3).
From the Turkey Creek mixed-seeding study, there appear to be several
options depending upon the objective. If the objective is rapid control of soil
erosion and weeds in areas with frequent disturbance, then the core mix plus
crested wheatgrass is the best choice. If there are four or more years between
disturbances, or if disturbances are light and erosion and weeds are not problems,
then the military mix with western wheatgrass predominating is the optimum
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