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Field Survey Summary Tables – Ecodistrict 818
83
Table 78. 2009 irrigated fields in the Bow City Plain Ecodistrict (818) in the Mixed Grassland Ecoregion
(20 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
68.8
29.9
43.5
4.6
6.6
16.6
67.1
2
Wild oats
25.0
10.1
40.2
3.3
13.2
49.2
34.0
3
Wheat
16.4
10.6
65.0
2.6
15.7
30.0
28.1
4
Wild buckwheat
45.3
10.6
23.5
1.0
2.1
7.8
23.9
5
Lamb's-quarters
45.3
8.0
17.7
0.6
1.3
4.8
19.5
6
Redroot pigweed
35.2
5.7
16.1
0.5
1.4
5.0
14.7
7
Kochia
44.5
5.2
11.6
0.2
0.6
1.0
14.7
8
Canada thistle
35.2
4.2
11.9
0.3
0.8
2.4
12.2
9
Alfalfa
28.9
4.8
16.5
0.2
0.9
2.4
11.3
10
Canola (Argentine)
10.9
6.0
55.0
0.5
4.9
6.0
10.5
11
Barnyard grass
9.4
5.2
55.0
0.6
6.4
7.8
9.9
12
Shepherd's-purse
15.6
4.6
29.2
0.4
2.8
4.2
9.6
13
Quack grass
19.5
2.7
13.6
0.2
1.0
1.4
7.3
14
Green foxtail
14.1
3.1
21.7
0.3
2.1
4.0
7.2
15
Round-leaved mallow
10.2
2.6
25.8
0.2
2.4
5.0
5.7
16
Foxtail barley
10.2
1.0
9.6
< 0.1
0.4
0.6
3.1
17
Pale smartweed
10.2
0.7
7.3
< 0.1
0.3
0.4
2.8
18
Flixweed
10.2
0.5
5.0
< 0.1
0.2
0.2
2.6
19
Smooth brome
4.7
0.9
20.0
0.1
1.2
1.2
2.1
20
Spiny annual sow-thistle
4.7
0.7
15.0
0.1
1.4
1.4
1.9
21
Prickly lettuce
4.7
0.7
15.0
< 0.1
0.8
0.8
1.8
22
Common burdock
4.7
0.5
10.0
0.1
1.4
1.4
1.7
23
Narrow-leaved hawk's-beard
4.7
0.7
15.0
< 0.1
0.6
0.6
1.7
24
Downy brome
5.5
0.3
5.0
< 0.1
0.4
0.4
1.4
25
Silver sagebrush
4.7
0.5
10.0
< 0.1
0.4
0.4
1.4
26
Stinkweed
5.5
0.3
5.0
< 0.1
0.2
0.2
1.4
27
Showy milkweed
4.7
0.2
5.0
< 0.1
0.4
0.4
1.2
28
Russian thistle
4.7
0.2
5.0
< 0.1
0.2
0.2
1.2