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Field Survey Summary Tables – Mixed Grassland Ecoregion
55
Table 40. 2009 irrigated spring wheat in the Mixed Grassland Ecoregion (104 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
53.3
9.7
18.2
1.8
3.4
49.2
43.3
2
Wild buckwheat
48.9
12.0
24.6
1.3
2.7
28.0
40.4
3
Kochia
50.3
8.8
17.5
1.2
2.3
41.6
35.1
4
Lamb's-quarters
33.0
6.3
19.2
0.8
2.5
19.8
24.4
5
Alfalfa
14.1
4.9
34.5
1.1
7.6
36.8
20.1
6
Dandelion
23.2
6.5
27.8
0.6
2.6
11.0
19.9
7
Canola (Argentine)
18.4
4.7
25.6
0.7
3.9
32.4
17.7
8
Green foxtail
19.3
4.5
23.3
0.4
2.1
6.4
14.5
9
Canada thistle
27.7
3.6
13.0
0.2
0.8
2.4
13.6
10
Stinkweed
12.0
1.6
12.9
0.6
5.1
41.4
10.8
11
Redroot pigweed
19.9
2.0
9.9
0.2
1.1
7.2
9.6
12
Round-leaved mallow
14.6
2.2
15.4
0.2
1.1
3.4
8.0
13
Spiny annual sow-thistle
3.5
1.5
43.1
0.5
13.7
57.6
7.3
14
Foxtail barley
6.6
0.8
12.7
0.2
3.7
15.0
5.0
15
Perennial sow-thistle
3.9
1.2
30.3
0.2
4.2
14.2
4.1
16
Shepherd's-purse
6.4
0.8
11.9
0.1
1.0
3.0
3.2
17
Flixweed
6.3
0.4
6.8
< 0.1
0.4
1.2
2.4
18
Pale smartweed
5.1
0.5
9.2
< 0.1
0.9
2.0
2.3
19
Smooth brome
1.8
0.6
35.0
0.1
2.8
3.2
1.8
20
Russian thistle
3.9
0.4
9.0
< 0.1
0.6
1.2
1.7
21
Prickly lettuce
1.8
0.6
32.5
< 0.1
2.2
3.6
1.6
22
Annual sow-thistle
2.9
0.5
16.2
< 0.1
0.8
1.4
1.5
23
Field bindweed
4.0
0.2
5.0
< 0.1
0.2
0.4
1.4
24
Narrow-leaved hawk's-beard
2.8
0.3
11.7
< 0.1
0.7
1.2
1.3
25
Stork's-bill
2.4
0.3
14.4
< 0.1
0.9
1.6
1.2
26
Broad-leaved plantain
2.2
0.3
13.4
< 0.1
1.2
2.2
1.2
27
Cow cockle
1.0
0.4
35.0
< 0.1
1.8
1.8
0.9
28
Wild tomato
2.1
0.2
7.5
< 0.1
0.8
1.2
0.9
29
Quack grass
1.8
0.2
10.0
< 0.1
0.8
1.4
0.8
30
Chickweed
1.8
0.1
7.5
< 0.1
0.5
0.8
0.7
31
Downy brome
1.0
0.2
15.0
< 0.1
0.6
0.6
0.5
32
Goat's-beard
1.3
0.1
5.0
< 0.1
0.2
0.2
0.4
33
Wild mustard
1.3
0.1
5.0
< 0.1
0.2
0.2
0.4
34
Timothy
0.9
0.1
10.0
< 0.1
0.6
0.6
0.4
35
Barnyard grass
0.9
0.1
10.0
< 0.1
0.4
0.4
0.4
36
Persian darnel
1.1
0.1
5.0
< 0.1
0.2
0.2
0.4
37
Showy milkweed
0.9
< 0.1
5.0
< 0.1
0.6
0.6
0.3
38
Cleavers
0.9
< 0.1
5.0
< 0.1
0.2
0.2
0.3