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Field Survey Summary Tables – Bow River Irrigation District
138
Table 160. 2009 irrigated broad-leaved annual crops in Bow River Irrigation District (35 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Smooth brome
6.5
4.9
75.0
2.3
34.9
61.6
67.4
2
Wild oats
20.9
6.6
31.6
1.3
6.4
24.2
64.9
3
Kochia
12.1
1.7
13.8
0.5
3.9
13.6
23.9
4
Canola (Argentine)
16.8
2.1
12.5
0.1
0.5
1.0
20.9
5
Lamb's-quarters
11.2
1.8
16.3
0.1
0.9
1.6
16.1
6
Dandelion
9.3
1.9
20.2
0.1
1.3
2.8
15.5
7
Redroot pigweed
5.6
1.1
20.0
0.1
1.2
2.2
9.2
8
Perennial sow-thistle
6.5
1.0
15.0
0.1
0.8
0.8
9.0
9
Persian darnel
3.2
1.0
30.0
0.2
5.0
5.0
9.0
10
Barnyard grass
2.8
1.4
50.0
0.1
3.2
3.2
8.8
11
Wheat
6.5
0.8
12.5
0.1
0.9
1.6
8.6
12
Wild buckwheat
8.8
0.4
5.0
< 0.1
0.2
0.2
8.0
13
Canada thistle
6.0
0.3
5.0
< 0.1
0.2
0.2
5.5
14
Spiny annual sow-thistle
3.2
0.6
20.0
< 0.1
1.2
1.2
5.3
15
Purslane
2.8
0.4
15.0
< 0.1
1.4
1.4
4.2
16
Common groundsel
2.8
0.4
15.0
< 0.1
0.8
0.8
3.9
17
Alfalfa
2.8
0.4
15.0
< 0.1
0.6
0.6
3.8
18
Foxtail barley
3.2
0.2
5.0
< 0.1
0.2
0.2
2.9
19
Ball mustard
3.2
0.2
5.0
< 0.1
0.2
0.2
2.9
20
Flixweed
2.8
0.1
5.0
< 0.1
0.2
0.2
2.5
21
Green foxtail
2.8
0.1
5.0
< 0.1
0.2
0.2
2.5
22
Quack grass
2.8
0.1
5.0
< 0.1
0.2
0.2
2.5
23
Stinkweed
2.8
0.1
5.0
< 0.1
0.2
0.2
2.5
Table 161. 2009 irrigated canola in Bow River Irrigation District (13 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Smooth brome
17.0
12.8
75.0
5.9
34.9
61.6
118.8
2
Wild oats
17.0
9.4
55.0
2.9
16.8
24.2
75.3
3
Perennial sow-thistle
17.0
2.6
15.0
0.1
0.8
0.8
24.8
4
Dandelion
8.5
3.4
40.0
0.2
2.8
2.8
20.9
5
Spiny annual sow-thistle
8.5
1.7
20.0
0.1
1.2
1.2
14.1
6
Wild buckwheat
8.5
0.4
5.0
< 0.1
0.2
0.2
9.2
7
Kochia
8.5
0.4
5.0
< 0.1
0.2
0.2
9.2
8
Ball mustard
8.5
0.4
5.0
< 0.1
0.2
0.2
9.2
9
Canada thistle
8.5
0.4
5.0
< 0.1
0.2
0.2
9.2
10
Wheat
8.5
0.4
5.0
< 0.1
0.2
0.2
9.2