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Field Survey Summary Tables – Ecodistrict 793
69
Table 58. 2009 irrigated annual crops in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed
Grassland Ecoregion (128 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
47.3
15.9
33.6
4.4
9.3
73.4
48.9
2
Wild buckwheat
53.4
14.2
26.6
1.7
3.2
25.6
34.9
3
Wild oats
38.3
11.2
29.3
1.9
5.0
47.0
29.6
4
Kochia
42.3
8.7
20.6
1.7
4.0
89.6
27.0
5
Canola (Argentine)
21.8
8.8
40.2
1.3
6.1
36.4
20.4
6
Round-leaved mallow
36.7
7.6
20.7
0.8
2.1
28.6
19.8
7
Lamb's-quarters
30.4
7.4
24.5
0.9
2.9
34.8
18.8
8
Chickweed
7.1
2.2
30.3
2.8
39.5
206.0
18.3
9
Dandelion
33.3
5.7
17.0
0.5
1.4
13.4
15.6
10
Annual sow-thistle
16.2
4.6
28.7
0.6
3.8
27.2
11.4
11
Canada thistle
18.3
3.8
20.8
0.4
2.1
13.2
9.9
12
Quack grass
10.5
2.6
24.7
0.6
6.0
28.4
8.2
13
Alfalfa
9.6
2.0
20.6
0.7
7.6
106.2
7.9
14
Shepherd's-purse
5.7
1.4
25.3
0.2
3.0
15.8
3.6
15
Perennial sow-thistle
5.9
1.1
18.9
0.2
2.8
19.6
3.3
16
Prostrate knotweed
5.8
1.0
18.0
0.1
1.9
7.6
2.9
17
Cleavers
4.0
1.2
29.4
0.1
1.6
3.6
2.4
18
Field bindweed
5.5
0.9
16.0
< 0.1
0.9
1.6
2.4
19
Stinkweed
5.9
0.6
9.5
< 0.1
0.6
1.6
2.1
20
Wheat
1.5
0.8
49.8
0.1
8.8
13.4
1.8
21
Stork's-bill
5.4
0.4
7.9
< 0.1
0.3
0.6
1.8
22
Prickly lettuce
2.5
0.7
26.4
0.1
2.3
5.4
1.5
23
Pale smartweed
3.9
0.4
10.8
< 0.1
0.7
1.2
1.5
24
Green foxtail
3.3
0.3
8.3
< 0.1
0.6
1.0
1.1
25
Foxtail barley
0.6
0.2
40.0
0.1
15.2
15.2
0.8
26
Russian thistle
0.9
0.3
30.0
< 0.1
3.4
3.4
0.7
27
Corn spurry
1.9
0.1
7.5
< 0.1
0.3
0.4
0.6
28
Barley
1.1
0.2
20.0
< 0.1
1.2
1.2
0.5
29
Barnyard grass
0.6
0.1
25.0
< 0.1
6.2
6.2
0.5
30
Wild tomato
0.9
0.1
15.0
< 0.1
1.4
1.4
0.4
31
Downy brome
1.1
0.1
10.0
< 0.1
0.4
0.4
0.4
32
Oats
1.1
0.1
5.0
< 0.1
0.4
0.4
0.3
33
Flixweed
0.9
< 0.1
5.0
< 0.1
0.2
0.2
0.3
34
Silky lupin
0.6
0.1
20.0
< 0.1
1.0
1.0
0.3
35
Millet
0.6
< 0.1
5.0
< 0.1
0.2
0.2
0.2