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Field Survey Summary Tables – Ecodistrict 793
68
Table 57. 2009 irrigated crops in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed Grassland
Ecoregion (153 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
41.6
13.6
32.8
3.7
8.9
73.4
44.2
2
Dandelion
39.1
12.8
32.7
2.5
6.4
98.6
36.2
3
Wild buckwheat
46.0
12.2
26.5
1.5
3.2
25.6
31.9
4
Wild oats
31.5
9.2
29.3
1.6
5.0
47.0
25.8
5
Kochia
37.2
7.4
19.9
1.5
4.0
89.6
24.8
6
Lamb's-quarters
28.9
6.8
23.5
0.8
2.7
34.8
18.3
7
Canola (Argentine)
19.4
7.3
37.9
1.1
5.7
36.4
18.3
8
Round-leaved mallow
31.1
6.3
20.2
0.6
2.1
28.6
17.7
9
Chickweed
5.9
1.8
30.3
2.3
39.5
206.0
15.7
10
Canada thistle
21.2
4.4
20.6
0.5
2.5
26.8
12.6
11
Annual sow-thistle
13.3
3.8
28.7
0.5
3.8
27.2
9.9
12
Quack grass
10.0
2.3
22.9
0.5
5.3
28.4
7.7
13
Alfalfa
9.1
1.7
18.4
0.6
6.6
106.2
7.2
14
Shepherd's-purse
6.3
1.5
23.2
0.2
2.6
15.8
4.0
15
Perennial sow-thistle
5.8
1.0
16.7
0.1
2.4
19.6
3.2
16
Prostrate knotweed
5.2
1.1
20.6
0.1
2.1
7.6
3.0
17
Stinkweed
6.7
0.6
8.9
< 0.1
0.5
1.6
2.5
18
Cleavers
3.3
1.0
29.4
0.1
1.6
3.6
2.1
19
Field bindweed
4.5
0.7
16.0
< 0.1
0.9
1.6
2.1
20
Pale smartweed
3.7
0.5
12.6
< 0.1
0.8
2.0
1.6
21
Wheat
1.3
0.6
49.8
0.1
8.8
13.4
1.6
22
Stork's-bill
4.5
0.3
7.9
< 0.1
0.3
0.6
1.6
23
Prickly lettuce
2.1
0.5
26.4
< 0.1
2.3
5.4
1.3
24
Green foxtail
2.7
0.2
8.3
< 0.1
0.6
1.0
1.0
25
Russian thistle
1.6
0.3
17.5
< 0.1
1.8
3.4
0.8
26
Foxtail barley
0.5
0.2
40.0
0.1
15.2
15.2
0.7
27
Barnyard grass
1.0
0.2
17.5
< 0.1
3.4
6.2
0.6
28
Flixweed
1.7
0.1
7.7
< 0.1
0.3
0.4
0.6
29
Corn spurry
1.6
0.1
7.5
< 0.1
0.3
0.4
0.5
30
Barley
0.9
0.2
20.0
< 0.1
1.2
1.2
0.5
31
Wild tomato
0.8
0.1
15.0
< 0.1
1.4
1.4
0.4
32
Downy brome
0.9
0.1
10.0
< 0.1
0.4
0.4
0.3
33
Oats
0.9
< 0.1
5.0
< 0.1
0.4
0.4
0.3
34
Black medick
0.9
< 0.1
5.0
< 0.1
0.2
0.2
0.3
35
Silky lupin
0.5
0.1
20.0
< 0.1
1.0
1.0
0.2
36
Field dock
0.5
< 0.1
5.0
< 0.1
0.2
0.2
0.2
37
Millet
0.5
< 0.1
5.0
< 0.1
0.2
0.2
0.2