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Field Survey Summary Tables – Ecodistrict 828
92
Table 90. 2009 irrigated annual crops in the Foremost Plain Ecodistrict (828) in the Mixed Grassland
Ecoregion (97 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Kochia
55.2
9.0
16.4
0.9
1.7
14.6
61.7
2
Wild oats
40.4
7.6
18.8
1.0
2.4
14.4
53.8
3
Wild buckwheat
37.3
6.9
18.4
0.6
1.5
28.0
42.4
4
Lamb's-quarters
24.1
3.4
14.1
0.3
1.2
12.2
23.0
5
Round-leaved mallow
20.2
3.3
16.5
0.2
1.0
2.4
19.7
6
Canada thistle
17.5
2.0
11.4
0.2
1.2
7.0
15.7
7
Spiny annual sow-thistle
0.8
0.8 100.0
0.4
57.6
57.6
11.6
8
Green foxtail
3.8
1.1
29.2
0.2
6.5
13.0
9.5
9
Canola (Argentine)
8.8
1.2
13.9
0.1
1.0
2.6
8.0
10
Redroot pigweed
9.9
1.2
11.7
0.1
0.6
1.6
7.7
11
Alfalfa
2.7
0.6
21.2
0.2
7.0
19.2
6.5
12
Dandelion
7.2
0.8
11.2
< 0.1
0.6
1.8
5.5
13
Stinkweed
7.7
0.6
7.9
< 0.1
0.3
0.8
4.8
14
Wheat
2.7
0.6
21.4
0.1
3.8
8.0
4.6
15
Wild tomato
5.1
0.4
7.1
< 0.1
0.8
1.4
3.6
16
Field bindweed
3.9
0.3
8.8
< 0.1
0.7
1.6
2.8
17
Sunflower species
2.9
0.4
13.3
< 0.1
1.1
1.6
2.7
18
Flixweed
4.4
0.3
6.3
< 0.1
0.3
0.4
2.5
19
Cow cockle
1.1
0.4
35.0
< 0.1
1.8
1.8
1.7
20
Downy brome
2.1
0.2
10.3
< 0.1
0.9
1.2
1.7
21
Foxtail barley
2.1
0.2
7.7
< 0.1
0.7
1.0
1.4
22
Russian thistle
2.2
0.2
7.5
< 0.1
0.3
0.4
1.3
23
Perennial sow-thistle
2.1
0.1
5.0
< 0.1
0.6
0.6
1.3
24
Goat's-beard
2.3
0.1
5.0
< 0.1
0.2
0.2
1.2
25
Pale smartweed
0.8
0.2
20.0
< 0.1
2.0
2.0
1.0
26
Prostrate pigweed
1.1
0.2
15.0
< 0.1
0.6
0.6
0.9
27
Barley
1.0
0.1
15.0
< 0.1
0.6
0.6
0.8
28
Showy milkweed
1.0
0.1
10.0
< 0.1
0.8
0.8
0.8
29
Annual sow-thistle
1.1
0.1
5.0
< 0.1
0.2
0.2
0.6
30
Quack grass
1.0
< 0.1
5.0
< 0.1
0.4
0.4
0.6
31
Corn
0.8
0.1
10.0
< 0.1
0.4
0.4
0.5