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Field Survey Summary Tables – Ecodistrict 793
70
Table 59. 2009 irrigated cereal crops in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed
Grassland Ecoregion (111 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
46.7
17.4
37.3
5.0
10.7
73.4
50.2
2
Wild buckwheat
55.7
15.7
28.1
1.9
3.5
25.6
36.5
3
Wild oats
39.9
11.6
29.1
2.1
5.3
47.0
29.8
4
Kochia
40.5
8.6
21.3
1.9
4.6
89.6
26.1
5
Canola (Argentine)
24.3
9.8
40.2
1.5
6.2
36.4
21.7
6
Round-leaved mallow
37.7
8.5
22.5
0.9
2.3
28.6
20.7
7
Chickweed
7.5
2.4
31.8
3.2
43.0
206.0
19.0
8
Lamb's-quarters
31.1
7.1
22.7
0.9
2.9
34.8
17.9
9
Dandelion
35.6
5.9
16.6
0.5
1.4
13.4
16.0
10
Annual sow-thistle
14.0
4.4
31.1
0.6
4.6
27.2
10.3
11
Alfalfa
11.0
2.3
20.6
0.8
7.6
106.2
8.5
12
Canada thistle
15.4
3.4
22.1
0.4
2.4
13.2
8.5
13
Quack grass
9.2
2.8
30.5
0.7
7.7
28.4
8.0
14
Shepherd's-purse
5.9
1.6
27.5
0.2
3.3
15.8
3.8
15
Perennial sow-thistle
6.8
1.3
18.9
0.2
2.8
19.6
3.7
16
Prostrate knotweed
6.6
1.2
18.0
0.1
1.9
7.6
3.2
17
Field bindweed
6.3
1.0
16.0
0.1
0.9
1.6
2.7
18
Stork's-bill
6.2
0.5
7.9
< 0.1
0.3
0.6
2.0
19
Cleavers
2.9
0.9
31.0
0.1
1.9
3.6
1.7
20
Prickly lettuce
2.9
0.8
26.4
0.1
2.3
5.4
1.7
21
Pale smartweed
4.5
0.5
10.8
< 0.1
0.7
1.2
1.6
22
Stinkweed
4.6
0.4
8.8
< 0.1
0.6
1.6
1.6
23
Green foxtail
3.1
0.3
9.0
< 0.1
0.6
1.0
1.1
24
Foxtail barley
0.6
0.3
40.0
0.1
15.2
15.2
0.8
25
Barnyard grass
0.7
0.2
25.0
< 0.1
6.2
6.2
0.5
26
Wild tomato
1.1
0.2
15.0
< 0.1
1.4
1.4
0.5
27
Downy brome
1.3
0.1
10.0
< 0.1
0.4
0.4
0.4
28
Oats
1.3
0.1
5.0
< 0.1
0.4
0.4
0.4
29
Corn spurry
1.1
0.1
10.0
< 0.1
0.4
0.4
0.4
30
Flixweed
1.1
0.1
5.0
< 0.1
0.2
0.2
0.3
31
Silky lupin
0.6
0.1
20.0
< 0.1
1.0
1.0
0.3