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Field Survey Summary Tables – Mixed Grassland Ecoregion
62
Table 49. 2009 irrigated alfalfa in the Mixed Grassland Ecoregion (72 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
85.6
51.5
60.2
11.9
13.9
73.8
140.3
2
Canada thistle
36.0
6.5
18.1
0.6
1.6
9.4
21.3
3
Lamb's-quarters
20.7
5.4
26.3
1.0
4.7
31.2
17.2
4
Green foxtail
6.5
3.8
58.4
1.9
29.0
84.6
15.5
5
Kochia
19.0
2.8
14.7
0.6
3.3
31.4
12.2
6
Smooth brome
11.9
3.4
28.3
0.6
5.2
30.6
10.4
7
Quack grass
16.8
2.6
15.2
0.4
2.3
13.0
10.1
8
Redroot pigweed
9.5
3.3
34.6
0.6
6.7
26.4
9.6
9
Wild buckwheat
7.6
3.9
50.9
0.6
7.8
15.8
9.4
10
Perennial sow-thistle
10.5
2.7
26.1
0.3
2.5
7.6
7.6
11
Stinkweed
3.7
1.6
45.0
0.5
15.0
28.2
5.6
12
Wild oats
9.7
1.3
13.5
0.2
2.1
7.6
5.6
13
Foxtail barley
9.2
1.1
11.4
0.1
1.0
3.0
4.6
14
Barnyard grass
5.8
1.5
26.1
0.1
2.4
5.2
4.1
15
Field bindweed
5.5
0.9
16.7
0.1
2.6
6.2
3.5
16
Narrow-leaved hawk's-beard
4.0
1.1
26.7
0.1
1.5
2.2
2.7
17
Spiny annual sow-thistle
4.5
0.4
9.4
< 0.1
0.5
0.8
2.0
18
Shepherd's-purse
4.0
0.3
8.3
< 0.1
0.5
0.8
1.7
19
Annual sow-thistle
2.6
0.5
17.5
< 0.1
1.3
2.4
1.5
20
Yellow sweet-clover
2.6
0.3
12.5
< 0.1
0.8
1.4
1.3
21
Tartary buckwheat
1.5
0.5
35.0
< 0.1
2.2
2.2
1.2
22
Wheat
1.8
0.3
15.0
0.1
3.2
3.2
1.2
23
Curled dock
2.6
0.2
7.5
< 0.1
0.3
0.4
1.1
24
Russian thistle
2.6
0.1
5.0
< 0.1
0.2
0.2
1.0
25
Pale smartweed
1.8
0.3
15.0
< 0.1
1.4
1.4
1.0
26
Wild mustard
1.8
0.2
10.0
< 0.1
0.6
0.6
0.8
27
Goat's-beard
1.3
0.2
15.0
< 0.1
1.8
1.8
0.8
28
Broad-leaved plantain
1.8
0.1
5.0
< 0.1
0.4
0.4
0.7
29
White cockle
1.8
0.1
5.0
< 0.1
0.2
0.2
0.7
30
Prickly lettuce
1.8
0.1
5.0
< 0.1
0.2
0.2
0.7
31
Common burdock
1.3
0.1
10.0
< 0.1
1.4
1.4
0.7
32
Silver sagebrush
1.3
0.1
10.0
< 0.1
0.4
0.4
0.6
33
White clover
1.3
0.1
10.0
< 0.1
0.4
0.4
0.6
34
Showy milkweed
1.3
0.1
5.0
< 0.1
0.4
0.4
0.5
35
Bull thistle
1.3
0.1
5.0
< 0.1
0.4
0.4
0.5
36
Flixweed
1.3
0.1
5.0
< 0.1
0.2
0.2
0.5
37
Round-leaved mallow
1.3
0.1
5.0
< 0.1
0.2
0.2
0.5
38
Canola (Argentine)
1.3
0.1
5.0
< 0.1
0.2
0.2
0.5