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Field Survey Summary Tables – Bow River Irrigation District
139
Table 162. 2009 irrigated perennial crops in Bow River Irrigation District (18 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
62.0
28.7
46.2
4.8
7.8
20.8
139.8
2
Canada thistle
22.4
8.0
35.8
0.8
3.4
9.0
33.6
3
Quack grass
25.9
3.1
12.0
0.4
1.6
3.0
23.0
4
Foxtail barley
21.6
3.3
15.2
0.2
1.1
1.8
18.7
5
Redroot pigweed
5.2
4.1
80.0
0.5
9.0
9.0
15.4
6
Lamb's-quarters
11.2
3.9
35.1
0.2
2.1
4.4
14.9
7
Green foxtail
6.0
3.3
55.0
0.3
4.4
4.4
11.7
8
Perennial sow-thistle
11.2
2.3
20.7
0.1
1.0
1.4
10.6
9
Kochia
16.4
1.1
6.8
< 0.1
0.3
0.4
10.2
10
Tartary buckwheat
6.0
2.1
35.0
0.1
2.2
2.2
8.0
11
Wild oats
5.2
0.5
10.0
0.1
1.4
1.4
4.3
12
Rough cinquefoil
6.0
0.3
5.0
< 0.1
0.2
0.2
3.5
13
Flixweed
5.2
0.3
5.0
< 0.1
0.2
0.2
3.0
14
Canola (Argentine)
5.2
0.3
5.0
< 0.1
0.2
0.2
3.0
Table 163. 2009 irrigated alfalfa in Bow River Irrigation District (15 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
61.0
33.9
55.5
5.8
9.5
20.8
143.6
2
Canada thistle
20.0
7.2
36.1
0.8
3.9
9.0
28.6
3
Quack grass
31.6
3.8
12.0
0.5
1.6
3.0
26.3
4
Redroot pigweed
6.3
5.1
80.0
0.6
9.0
9.0
16.8
5
Lamb's-quarters
13.7
4.8
35.1
0.3
2.1
4.4
16.7
6
Foxtail barley
19.0
2.5
13.3
0.2
0.9
1.8
14.5
7
Green foxtail
7.3
4.0
55.0
0.3
4.4
4.4
13.0
8
Perennial sow-thistle
13.7
2.8
20.7
0.1
1.0
1.4
12.2
9
Tartary buckwheat
7.3
2.6
35.0
0.2
2.2
2.2
9.0
10
Kochia
12.7
0.6
5.0
< 0.1
0.2
0.2
7.2
11
Wild oats
6.3
0.6
10.0
0.1
1.4
1.4
4.9
12
Flixweed
6.3
0.3
5.0
< 0.1
0.2
0.2
3.6
13
Canola (Argentine)
6.3
0.3
5.0
< 0.1
0.2
0.2
3.6