Basic HTML Version
Field Survey Summary Tables – Mixed Grassland Ecoregion
53
Table 38. 2009 irrigated annual crops in the Mixed Grassland Ecoregion (278 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
37.8
8.3
21.9
1.4
3.7
49.2
40.4
2
Wild buckwheat
44.0
9.8
22.2
0.8
1.9
28.0
38.0
3
Kochia
43.1
6.8
15.9
0.8
1.8
41.6
32.8
4
Lamb's-quarters
27.3
5.9
21.6
0.8
3.1
35.8
27.0
5
Redroot pigweed
20.0
3.6
18.2
0.7
3.5
58.6
19.9
6
Dandelion
19.3
4.6
23.8
0.4
2.2
13.0
17.8
7
Green foxtail
14.4
3.5
24.3
0.4
3.0
28.8
14.8
8
Alfalfa
9.6
3.0
30.8
0.5
5.5
36.8
13.8
9
Canola (Argentine)
13.4
3.4
25.3
0.4
2.8
32.4
13.7
10
Canada thistle
19.7
2.4
12.2
0.2
1.1
10.0
12.3
11
Round-leaved mallow
12.0
2.0
16.9
0.1
1.1
5.0
8.3
12
Stinkweed
8.0
1.1
13.1
0.3
3.3
41.4
7.1
13
Wheat
4.3
1.3
29.0
0.3
5.8
30.0
6.2
14
Smooth brome
2.2
0.9
40.1
0.3
13.6
61.6
5.6
15
Perennial sow-thistle
3.4
1.0
28.8
0.1
3.9
15.6
4.1
16
Spiny annual sow-thistle
2.0
0.7
34.7
0.2
9.2
57.6
3.9
17
Barnyard grass
3.3
0.9
28.6
0.1
3.2
11.8
3.7
18
Shepherd's-purse
4.6
0.9
19.2
0.1
1.6
4.2
3.6
19
Foxtail barley
4.8
0.5
10.2
0.1
2.2
15.0
3.4
20
Quack grass
3.6
0.5
13.2
0.1
1.9
7.4
2.6
21
Pale smartweed
3.8
0.4
9.6
< 0.1
1.0
3.8
2.2
22
Persian darnel
1.2
0.5
45.0
0.1
6.8
15.2
2.1
23
Flixweed
3.5
0.2
6.3
< 0.1
0.4
1.2
1.5
24
Annual sow-thistle
1.9
0.3
15.0
< 0.1
0.9
2.2
1.2
25
Russian thistle
2.2
0.2
7.7
< 0.1
0.4
1.2
1.0
26
Field bindweed
2.2
0.2
7.3
< 0.1
0.5
1.6
1.0
27
Wild mustard
0.9
0.3
36.8
< 0.1
2.7
5.6
1.0
28
Downy brome
1.6
0.2
13.4
< 0.1
1.0
1.6
1.0
29
Wild tomato
1.8
0.1
7.1
< 0.1
0.8
1.4
0.9
30
Narrow-leaved hawk's-beard
1.4
0.2
15.0
< 0.1
0.9
1.6
0.9
31
Barley
0.7
0.2
30.0
< 0.1
4.0
7.4
0.9
32
White mustard
0.3
0.2
60.0
< 0.1
9.4
9.4
0.8
33
Stork's-bill
1.3
0.2
13.2
< 0.1
0.8
1.6
0.7
34
Prickly lettuce
0.7
0.2
32.5
< 0.1
2.2
3.6
0.7
35
Sunflower species
1.0
0.1
13.3
< 0.1
1.1
1.6
0.7
36
Chickweed
1.0
0.1
11.7
< 0.1
0.7
1.0
0.6
37
Broad-leaved plantain
0.8
0.1
13.4
< 0.1
1.2
2.2
0.5
38
Tartary buckwheat
0.8
0.1
7.5
< 0.1
1.0
1.4
0.4
39
Cow cockle
0.4
0.1
35.0
< 0.1
1.8
1.8
0.4
40
Showy milkweed
0.7
0.1
7.5
< 0.1
0.7
0.8
0.3
41
Goat's-beard
0.8
< 0.1
5.0
< 0.1
0.2
0.2
0.3
42
Cleavers
0.7
0.1
7.5
< 0.1
0.3
0.4
0.3
43
Purslane
0.3
0.1
15.0
< 0.1
1.4
1.4
0.2
44
Prostrate pigweed
0.4
0.1
15.0
< 0.1
0.6
0.6
0.2
45
Common groundsel
0.3
0.1
15.0
< 0.1
0.8
0.8
0.2
46
Timothy
0.3
< 0.1
10.0
< 0.1
0.6
0.6
0.2
47
Ball mustard
0.4
< 0.1
5.0
< 0.1
0.2
0.2
0.2
48
Japanese brome
0.3
< 0.1
5.0
< 0.1
0.2
0.2
0.1
49
Corn
0.3
< 0.1
10.0
< 0.1
0.4
0.4
0.1