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Field Survey Summary Tables – Mixed Grassland Ecoregion
51
Table 37. 2009 irrigated crops in the Mixed Grassland Ecoregion (375 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
35.9
15.5
43.1
3.2
8.9
73.8
62.0
2
Wild buckwheat
34.5
8.2
23.6
0.7
2.1
28.0
29.0
3
Wild oats
30.1
6.4
21.3
1.1
3.6
49.2
28.2
4
Kochia
36.6
5.7
15.5
0.7
1.9
41.6
25.9
5
Lamb's-quarters
24.7
5.5
22.1
0.8
3.3
35.8
22.8
6
Redroot pigweed
16.8
3.3
19.8
0.6
3.8
58.6
15.9
7
Canada thistle
23.7
3.3
14.1
0.3
1.3
10.0
14.8
8
Green foxtail
11.9
3.3
27.9
0.7
5.8
84.6
14.6
9
Canola (Argentine)
10.5
2.6
24.5
0.3
2.7
32.4
9.5
10
Alfalfa
7.1
2.2
30.8
0.4
5.5
36.8
8.9
11
Smooth brome
4.5
1.4
32.0
0.4
7.9
61.6
6.6
12
Stinkweed
6.6
1.1
16.5
0.3
4.5
41.4
6.4
13
Round-leaved mallow
9.1
1.5
16.6
0.1
1.1
5.0
5.9
14
Foxtail barley
6.9
0.9
12.8
0.2
2.2
15.0
4.8
15
Perennial sow-thistle
4.6
1.3
27.6
0.2
3.3
15.6
4.6
16
Wheat
3.6
1.0
27.6
0.2
5.5
30.0
4.3
17
Quack grass
5.9
0.8
14.3
0.1
2.1
13.0
4.2
18
Barnyard grass
3.6
1.0
27.8
0.1
2.9
11.8
3.5
19
Spiny annual sow-thistle
2.6
0.6
24.5
0.1
5.6
57.6
3.1
20
Shepherd's-purse
4.2
0.7
17.2
0.1
1.4
4.2
2.8
21
Pale smartweed
3.2
0.3
10.2
< 0.1
1.0
3.8
1.8
22
Field bindweed
2.7
0.3
11.0
< 0.1
1.3
6.2
1.6
23
Persian darnel
0.9
0.4
45.0
0.1
6.8
15.2
1.4
24
Narrow-leaved hawk's-beard
1.8
0.4
20.0
< 0.1
1.1
2.2
1.2
25
Flixweed
2.8
0.2
6.1
< 0.1
0.3
1.2
1.2
26
Annual sow-thistle
1.9
0.3
15.6
< 0.1
1.0
2.4
1.2
27
Russian thistle
2.4
0.2
6.8
< 0.1
0.4
1.2
1.1
28
Wild mustard
1.0
0.3
27.4
< 0.1
1.9
5.6
0.9
29
Pasture sage
0.5
0.3
55.0
< 0.1
5.7
6.8
0.8
30
White sweet-clover
0.5
0.2
45.0
< 0.1
5.0
8.0
0.7
31
Downy brome
1.2
0.2
13.4
< 0.1
1.0
1.6
0.7
32
Wild tomato
1.3
0.1
7.1
< 0.1
0.8
1.4
0.7
33
Goat's-beard
1.4
0.1
7.8
< 0.1
0.6
1.8
0.7
34
Prickly lettuce
0.9
0.2
21.2
< 0.1
1.4
3.6
0.6
35
Broad-leaved plantain
1.2
0.1
9.2
< 0.1
0.7
2.2
0.6
36
Tartary buckwheat
0.9
0.1
16.7
< 0.1
1.4
2.2
0.6
37
Yellow sweet-clover
1.0
0.1
12.5
< 0.1
1.0
2.0
0.6
38
Barley
0.5
0.2
30.0
< 0.1
4.0
7.4
0.6
39
Stork's-bill
0.9
0.1
13.2
< 0.1
0.8
1.6
0.5
40
White mustard
0.3
0.2
60.0
< 0.1
9.4
9.4
0.5
41
Sunflower species
0.8
0.1
13.3
< 0.1
1.1
1.6
0.5
42
Chickweed
0.8
0.1
11.7
< 0.1
0.7
1.0
0.4
43
White clover
0.8
0.1
8.3
< 0.1
0.4
0.6
0.4
44
Showy milkweed
0.8
0.1
6.7
< 0.1
0.6
0.8
0.4
45
Cow cockle
0.3
0.1
35.0
< 0.1
1.8
1.8
0.3
46
Cleavers
0.5
< 0.1
7.5
< 0.1
0.3
0.4
0.2
47
Curled dock
0.5
< 0.1
7.5
< 0.1
0.3
0.4
0.2
48
Bull thistle
0.5
< 0.1
5.0
< 0.1
0.3
0.4
0.2
49
Prickly rose
0.3
0.1
20.0
< 0.1
2.2
2.2
0.2
50
Prostrate pigweed
0.3
< 0.1
15.0
< 0.1
0.6
0.6
0.2
51
Purslane
0.3
< 0.1
15.0
< 0.1
1.4
1.4
0.2
52
Common groundsel
0.3
< 0.1
15.0
< 0.1
0.8
0.8
0.2
(Table continued on next page)