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Field Survey Summary Tables – Alberta
24
Table 6. 2009 irrigated crops in Alberta (571 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
36.8
14.9
40.6
3.0
8.2
98.6
53.3
2
Wild buckwheat
37.4
9.2
24.7
0.9
2.5
28.0
30.1
3
Wild oats
29.7
6.9
23.4
1.2
3.9
49.2
26.7
4
Redroot pigweed
22.6
5.8
25.9
1.4
6.2
73.4
25.0
5
Kochia
34.8
5.9
16.8
0.9
2.5
89.6
24.5
6
Lamb's-quarters
25.1
5.6
22.4
0.8
3.0
35.8
20.5
7
Canada thistle
22.7
3.7
16.1
0.4
1.6
26.8
14.2
8
Canola (Argentine)
13.0
4.2
32.5
0.6
4.4
36.4
13.7
9
Round-leaved mallow
14.6
2.7
18.2
0.2
1.6
28.6
9.6
10
Green foxtail
8.5
2.2
26.2
0.5
5.3
84.6
8.8
11
Alfalfa
7.1
1.9
26.6
0.4
5.9
106.2
7.7
12
Chickweed
2.9
0.7
24.4
0.6
22.0
206.0
6.7
13
Stinkweed
6.8
1.1
16.0
0.3
3.8
41.4
5.4
14
Quack grass
6.9
1.2
17.1
0.2
3.2
28.4
5.3
15
Annual sow-thistle
6.8
1.4
21.2
0.2
2.3
27.2
5.1
16
Smooth brome
2.9
0.9
32.0
0.2
7.9
61.6
3.8
17
Shepherd's-purse
5.5
1.0
18.0
0.1
2.1
16.6
3.8
18
Perennial sow-thistle
4.5
1.1
23.9
0.1
3.0
19.6
3.8
19
Foxtail barley
5.3
0.7
12.6
0.1
2.3
15.2
3.4
20
Wheat
2.7
0.8
30.4
0.2
5.9
30.0
3.0
21
Barnyard grass
2.6
0.7
26.8
0.1
3.0
11.8
2.2
22
Field bindweed
3.5
0.5
15.4
0.1
1.4
6.2
2.1
23
Spiny annual sow-thistle
1.9
0.5
25.0
0.1
5.6
57.6
2.0
24
Pale smartweed
3.1
0.3
11.0
< 0.1
1.0
3.8
1.6
25
Flixweed
2.5
0.3
12.4
< 0.1
1.1
11.6
1.3
26
Cleavers
1.9
0.4
21.3
< 0.1
1.3
3.6
1.2
27
Downy brome
1.5
0.3
20.9
< 0.1
2.8
18.0
1.2
28
Barley
0.7
0.3
36.8
0.1
8.5
28.0
1.1
29
Narrow-leaved hawk's-beard
1.8
0.3
15.7
< 0.1
1.1
3.0
1.0
30
Russian thistle
2.3
0.2
8.5
< 0.1
0.6
3.4
1.0
31
Prostrate knotweed
1.4
0.3
20.6
< 0.1
2.1
7.6
1.0
32
Stork's-bill
2.1
0.2
9.7
< 0.1
0.6
1.6
1.0
33
Prickly lettuce
1.1
0.3
23.8
< 0.1
1.8
5.4
0.8
34
Persian darnel
0.6
0.3
45.0
< 0.1
6.8
15.2
0.8
35
Wild mustard
0.8
0.2
25.9
< 0.1
1.7
5.6
0.6
36
Wild tomato
1.1
0.1
8.6
< 0.1
0.9
1.4
0.5
37
Pasture sage
0.3
0.2
55.0
< 0.1
5.7
6.8
0.5
38
White sweet-clover
0.3
0.2
45.0
< 0.1
5.0
8.0
0.4
39
Tartary buckwheat
0.7
0.1
14.6
< 0.1
1.4
2.2
0.4
40
Goat's-beard
0.9
0.1
7.8
< 0.1
0.6
1.8
0.4
41
Broad-leaved plantain
0.8
0.1
9.2
< 0.1
0.7
2.2
0.4
42
Yellow sweet-clover
0.7
0.1
12.5
< 0.1
1.0
2.0
0.4
43
Hemp-nettle
0.3
0.1
45.0
< 0.1
4.6
4.6
0.3
44
White mustard
0.2
0.1
60.0
< 0.1
9.4
9.4
0.3
45
Sunflower species
0.5
0.1
13.3
< 0.1
1.1
1.6
0.3
46
White clover
0.5
< 0.1
8.3
< 0.1
0.4
0.6
0.2
47
Showy milkweed
0.5
< 0.1
6.7
< 0.1
0.6
0.8
0.2
48
Corn spurry
0.4
< 0.1
7.5
< 0.1
0.3
0.4
0.2
49
Japanese brome
0.3
< 0.1
12.5
< 0.1
0.7
1.2
0.2
50
Cow cockle
0.2
0.1
35.0
< 0.1
1.8
1.8
0.2
51
Curled dock
0.3
< 0.1
7.5
< 0.1
0.3
0.4
0.1
52
Bull thistle
0.3
< 0.1
5.0
< 0.1
0.3
0.4
0.1
(Table continued on next page)