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Field Survey Summary Tables – Alberta
36
Table 17. 2009 irrigated perennial crops in Alberta (135 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
79.7
47.7
59.8
11.4
14.3
98.6
147.7
2
Canada thistle
35.9
6.4
18.0
0.7
1.9
26.8
24.0
3
Lamb's-quarters
17.5
4.0
22.6
0.6
3.4
31.2
14.1
4
Kochia
15.7
1.9
12.2
0.4
2.7
31.4
10.1
5
Green foxtail
3.5
2.0
58.4
1.0
29.0
84.6
9.2
6
Wild buckwheat
8.4
3.2
37.9
0.4
5.0
15.8
9.0
7
Redroot pigweed
8.7
2.4
27.7
0.4
5.1
26.4
8.4
8
Foxtail barley
12.0
1.6
13.3
0.2
1.9
12.8
7.3
9
Smooth brome
7.7
2.1
27.3
0.4
4.6
30.6
7.1
10
Quack grass
11.0
1.6
14.2
0.2
2.1
13.0
7.0
11
Stinkweed
6.2
1.7
26.6
0.5
7.9
28.2
6.9
12
Perennial sow-thistle
6.6
1.5
22.8
0.1
2.2
7.6
4.9
13
Wild oats
6.0
0.9
14.4
0.1
2.0
7.6
3.8
14
Shepherd's-purse
4.6
0.8
17.4
0.2
3.3
16.6
3.4
15
Barnyard grass
3.6
0.9
23.7
0.1
2.2
5.2
2.7
16
Narrow-leaved hawk's-beard
3.5
0.7
20.0
0.1
1.6
3.0
2.4
17
Downy brome
1.9
0.8
39.8
0.1
7.2
18.0
2.3
18
Field bindweed
3.4
0.5
14.9
0.1
2.5
6.2
2.3
19
Flixweed
2.4
0.8
33.1
0.1
3.6
11.6
2.3
20
Annual sow-thistle
3.5
0.6
17.0
< 0.1
1.0
2.4
2.1
21
Pasture sage
1.4
0.8
55.0
0.1
5.7
6.8
1.8
22
White sweet-clover
1.4
0.6
45.0
0.1
5.0
8.0
1.6
23
Spiny annual sow-thistle
3.1
0.3
10.7
< 0.1
0.7
1.4
1.6
24
Yellow sweet-clover
2.8
0.4
12.5
< 0.1
1.0
2.0
1.6
25
Canola (Argentine)
3.1
0.3
9.3
< 0.1
0.4
0.8
1.5
26
Russian thistle
3.0
0.1
5.0
< 0.1
0.2
0.2
1.3
27
Goat's-beard
2.1
0.2
10.0
< 0.1
0.9
1.8
1.1
28
Pale smartweed
1.5
0.3
18.6
< 0.1
1.6
2.0
1.0
29
White clover
2.1
0.2
8.3
< 0.1
0.4
0.6
1.0
30
Tartary buckwheat
1.3
0.3
23.4
< 0.1
2.0
2.2
1.0
31
Round-leaved mallow
1.7
0.1
5.0
< 0.1
0.2
0.2
0.7
32
Broad-leaved plantain
1.7
0.1
5.0
< 0.1
0.3
0.4
0.7
33
Wheat
1.0
0.1
15.0
< 0.1
3.2
3.2
0.7
34
Curled dock
1.4
0.1
7.5
< 0.1
0.3
0.4
0.6
35
Prostrate knotweed
0.5
0.2
45.0
< 0.1
4.2
4.2
0.6
36
Bull thistle
1.4
0.1
5.0
< 0.1
0.3
0.4
0.6
37
Alfalfa
1.4
0.1
5.0
< 0.1
0.2
0.2
0.6
38
Prickly rose
0.7
0.1
20.0
< 0.1
2.2
2.2
0.5
39
Wild mustard
1.0
0.1
10.0
< 0.1
0.6
0.6
0.5
40
Japanese brome
0.7
0.1
20.0
< 0.1
1.2
1.2
0.5
41
Black medick
1.0
0.1
5.0
< 0.1
0.2
0.2
0.4
42
Bluebur
0.7
0.1
15.0
< 0.1
1.2
1.2
0.4
43
White cockle
1.0
< 0.1
5.0
< 0.1
0.2
0.2
0.4
44
Prickly lettuce
1.0
< 0.1
5.0
< 0.1
0.2
0.2
0.4
45
Common burdock
0.7
0.1
10.0
< 0.1
1.4
1.4
0.4
46
Silver sagebrush
0.7
0.1
10.0
< 0.1
0.4
0.4
0.3
47
Rough cinquefoil
0.8
< 0.1
5.0
< 0.1
0.2
0.2
0.3
48
Showy milkweed
0.7
< 0.1
5.0
< 0.1
0.4
0.4
0.3
49
Field dock
0.5
< 0.1
5.0
< 0.1
0.2
0.2
0.2
50
Ball mustard
0.5
< 0.1
5.0
< 0.1
0.4
0.4
0.2