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Field Survey Summary Tables – Alberta
37
Table 18. 2009 irrigated alfalfa in Alberta (89 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
86.0
52.9
61.5
12.5
14.5
98.6
150.5
2
Canada thistle
32.5
5.7
17.6
0.5
1.5
9.4
19.8
3
Lamb's-quarters
20.4
4.9
24.0
0.8
4.1
31.2
16.6
4
Green foxtail
5.2
3.1
58.4
1.5
29.0
84.6
13.0
5
Kochia
15.3
2.3
14.7
0.5
3.3
31.4
10.3
6
Wild buckwheat
8.3
3.9
47.5
0.6
6.9
15.8
10.0
7
Quack grass
14.3
2.1
14.7
0.3
2.3
13.0
8.9
8
Redroot pigweed
9.3
2.8
30.2
0.5
5.6
26.4
8.9
9
Smooth brome
9.6
2.7
28.3
0.5
5.2
30.6
8.8
10
Perennial sow-thistle
10.0
2.3
22.8
0.2
2.2
7.6
7.0
11
Stinkweed
5.3
1.5
28.9
0.5
8.5
28.2
5.8
12
Wild oats
7.8
1.1
13.5
0.2
2.1
7.6
4.7
13
Foxtail barley
8.2
0.9
10.8
0.1
1.0
3.0
4.2
14
Barnyard grass
4.7
1.2
26.1
0.1
2.4
5.2
3.5
15
Field bindweed
4.4
0.7
16.7
0.1
2.6
6.2
2.9
16
Shepherd's-purse
4.8
0.7
14.0
< 0.1
1.0
3.4
2.6
17
Narrow-leaved hawk's-beard
3.2
0.8
26.7
< 0.1
1.5
2.2
2.2
18
Spiny annual sow-thistle
3.6
0.3
9.4
< 0.1
0.5
0.8
1.7
19
Canola (Argentine)
3.4
0.2
7.3
< 0.1
0.3
0.4
1.5
20
Pale smartweed
2.3
0.4
18.6
< 0.1
1.6
2.0
1.4
21
Annual sow-thistle
2.1
0.4
17.5
< 0.1
1.3
2.4
1.3
22
Flixweed
2.6
0.2
8.0
< 0.1
0.3
0.4
1.2
23
Yellow sweet-clover
2.1
0.3
12.5
< 0.1
0.8
1.4
1.1
24
Round-leaved mallow
2.6
0.1
5.0
< 0.1
0.2
0.2
1.1
25
Tartary buckwheat
1.2
0.4
35.0
< 0.1
2.2
2.2
1.0
26
Wheat
1.5
0.2
15.0
< 0.1
3.2
3.2
1.0
27
Curled dock
2.1
0.2
7.5
< 0.1
0.3
0.4
0.9
28
Russian thistle
2.1
0.1
5.0
< 0.1
0.2
0.2
0.9
29
Prostrate knotweed
0.8
0.4
45.0
< 0.1
4.2
4.2
0.9
30
Downy brome
1.1
0.3
25.0
< 0.1
1.2
1.2
0.7
31
Wild mustard
1.5
0.1
10.0
< 0.1
0.6
0.6
0.7
32
Goat's-beard
1.1
0.2
15.0
< 0.1
1.8
1.8
0.6
33
Broad-leaved plantain
1.5
0.1
5.0
< 0.1
0.4
0.4
0.6
34
White cockle
1.5
0.1
5.0
< 0.1
0.2
0.2
0.6
35
Prickly lettuce
1.5
0.1
5.0
< 0.1
0.2
0.2
0.6
36
Common burdock
1.1
0.1
10.0
< 0.1
1.4
1.4
0.6
37
Silver sagebrush
1.1
0.1
10.0
< 0.1
0.4
0.4
0.5
38
White clover
1.1
0.1
10.0
< 0.1
0.4
0.4
0.5
39
Showy milkweed
1.1
0.1
5.0
< 0.1
0.4
0.4
0.4
40
Bull thistle
1.1
0.1
5.0
< 0.1
0.4
0.4
0.4