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Field Survey Summary Tables – Mixed Grassland Ecoregion
54
Table 39. 2009 irrigated cereal crops in the Mixed Grassland Ecoregion (170 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
47.5
10.5
22.1
1.8
3.9
49.2
40.5
2
Wild buckwheat
52.0
12.6
24.2
1.2
2.3
28.0
38.3
3
Kochia
48.7
8.8
18.0
1.1
2.2
41.6
32.0
4
Lamb's-quarters
34.1
8.1
23.8
1.3
3.7
35.8
29.2
5
Redroot pigweed
23.9
4.4
18.5
1.0
4.2
58.6
19.9
6
Dandelion
24.3
6.4
26.2
0.6
2.5
13.0
19.0
7
Canola (Argentine)
18.4
5.1
27.7
0.6
3.3
32.4
15.9
8
Alfalfa
13.4
4.3
32.2
0.8
6.3
36.8
15.8
9
Green foxtail
19.3
4.5
23.3
0.6
2.9
28.8
15.1
10
Canada thistle
26.5
3.4
13.0
0.3
1.1
10.0
13.3
11
Stinkweed
11.2
1.6
14.4
0.4
3.7
41.4
8.4
12
Round-leaved mallow
13.2
1.9
14.5
0.1
0.9
3.4
6.6
13
Wheat
3.1
1.3
43.1
0.3
10.1
30.0
5.0
14
Shepherd's-purse
7.4
1.4
19.2
0.1
1.6
4.2
4.6
15
Perennial sow-thistle
4.2
1.4
33.0
0.2
4.8
15.6
4.5
16
Spiny annual sow-thistle
2.7
1.0
38.3
0.3
11.1
57.6
4.5
17
Foxtail barley
5.3
0.6
12.0
0.2
3.0
15.0
3.5
18
Pale smartweed
5.6
0.5
9.5
0.1
1.1
3.8
2.6
19
Quack grass
3.5
0.5
13.7
0.1
2.4
7.4
2.2
20
Persian darnel
1.3
0.7
52.5
0.1
7.7
15.2
2.0
21
Flixweed
4.5
0.3
6.6
< 0.1
0.4
1.2
1.6
22
Annual sow-thistle
3.1
0.5
15.0
< 0.1
0.9
2.2
1.6
23
Smooth brome
2.3
0.5
20.6
< 0.1
1.7
3.2
1.5
24
Wild mustard
1.4
0.5
36.8
< 0.1
2.7
5.6
1.3
25
Russian thistle
3.0
0.2
8.3
< 0.1
0.5
1.2
1.2
26
Narrow-leaved hawk's-beard
2.2
0.3
15.0
< 0.1
0.9
1.6
1.1
27
Field bindweed
3.0
0.2
5.9
< 0.1
0.3
0.4
1.0
28
White mustard
0.6
0.3
60.0
0.1
9.4
9.4
1.0
29
Prickly lettuce
1.1
0.4
32.5
< 0.1
2.2
3.6
0.9
30
Stork's-bill
1.5
0.2
14.4
< 0.1
0.9
1.6
0.7
31
Broad-leaved plantain
1.3
0.2
13.4
< 0.1
1.2
2.2
0.7
32
Barnyard grass
1.8
0.1
6.6
< 0.1
0.3
0.4
0.6
33
Tartary buckwheat
1.3
0.1
7.5
< 0.1
1.0
1.4
0.6
34
Downy brome
1.3
0.1
9.9
< 0.1
0.5
0.6
0.5
35
Cow cockle
0.6
0.2
35.0
< 0.1
1.8
1.8
0.5
36
Wild tomato
1.3
0.1
7.5
< 0.1
0.8
1.2
0.5
37
Chickweed
1.1
0.1
7.5
< 0.1
0.5
0.8
0.4
38
Barley
0.6
0.1
15.0
< 0.1
0.6
0.6
0.3
39
Goat's-beard
0.8
< 0.1
5.0
< 0.1
0.2
0.2
0.3
40
Sunflower species
0.6
0.1
10.0
< 0.1
0.8
0.8
0.2
41
Timothy
0.6
0.1
10.0
< 0.1
0.6
0.6
0.2
42
Showy milkweed
0.6
< 0.1
5.0
< 0.1
0.6
0.6
0.2
43
Cleavers
0.6
< 0.1
5.0
< 0.1
0.2
0.2
0.2