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Field Survey Summary Tables – Bow River Irrigation District
135
Table 156. 2009 irrigated annual crops in Bow River Irrigation District (83 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
33.0
10.2
30.9
2.1
6.4
49.2
54.2
2
Wild buckwheat
34.7
7.7
22.2
0.7
1.9
12.4
33.5
3
Canola (Argentine)
19.6
6.4
32.7
0.8
3.8
21.4
26.8
4
Kochia
28.1
4.3
15.4
0.4
1.6
13.6
22.9
5
Smooth brome
4.1
2.1
51.7
0.9
23.4
61.6
16.3
6
Green foxtail
13.0
3.1
24.0
0.5
3.7
28.8
15.7
7
Wheat
6.8
3.0
44.0
0.7
9.8
30.0
15.3
8
Perennial sow-thistle
7.9
3.1
39.0
0.4
5.4
15.6
13.2
9
Canada thistle
18.4
1.6
8.8
0.1
0.5
1.0
10.6
10
Lamb's-quarters
12.4
1.9
15.1
0.1
1.0
4.8
9.2
11
Redroot pigweed
13.6
1.5
10.9
0.1
1.0
3.0
9.1
12
Dandelion
7.7
2.2
28.7
0.2
2.4
8.4
8.8
13
Persian darnel
4.1
1.8
45.0
0.3
6.8
15.2
7.8
14
Stinkweed
7.9
1.7
21.2
0.1
1.6
4.6
7.3
15
Round-leaved mallow
8.4
1.4
16.2
0.1
1.0
2.2
6.3
16
Spiny annual sow-thistle
3.9
1.1
29.5
0.1
3.7
6.2
5.0
17
Foxtail barley
7.7
0.6
8.3
< 0.1
0.6
1.6
4.5
18
Shepherd's-purse
2.7
1.0
37.5
0.1
3.8
4.2
3.9
19
Alfalfa
3.7
0.8
22.7
< 0.1
1.2
2.6
3.3
20
Quack grass
3.9
0.6
15.5
0.1
1.7
3.6
3.2
21
Wild mustard
1.4
1.0
75.0
0.1
5.6
5.6
3.1
22
White mustard
1.2
0.7
60.0
0.1
9.4
9.4
2.9
23
Barnyard grass
2.5
0.7
25.8
< 0.1
1.7
3.2
2.5
24
Chickweed
2.7
0.3
12.5
< 0.1
1.5
2.4
2.0
25
Flixweed
3.7
0.2
5.0
< 0.1
0.2
0.2
1.8
26
Tartary buckwheat
2.7
0.2
7.5
< 0.1
1.0
1.4
1.7
27
Annual sow-thistle
2.7
0.2
7.5
< 0.1
0.9
1.6
1.6
28
Cleavers
1.4
0.4
30.0
< 0.1
1.8
1.8
1.5
29
Broad-leaved plantain
1.2
0.3
25.0
< 0.1
2.2
2.2
1.2
30
Russian thistle
1.4
0.2
15.0
< 0.1
1.2
1.2
1.0
31
Purslane
1.2
0.2
15.0
< 0.1
1.4
1.4
0.9
32
Common groundsel
1.2
0.2
15.0
< 0.1
0.8
0.8
0.8
33
Downy brome
1.4
0.1
5.0
< 0.1
0.4
0.4
0.7
34
Ball mustard
1.4
0.1
5.0
< 0.1
0.2
0.2
0.6
35
Pale smartweed
1.4
0.1
5.0
< 0.1
0.2
0.2
0.6