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Field Survey Summary Tables – Lethbridge Northern Irrigation District
147
Table 173. 2009 irrigated fields in Lethbridge Northern Irrigation District (79 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
43.6
13.7
31.4
3.7
8.4
73.4
46.8
2
Dandelion
33.5
10.8
32.1
2.9
8.7
98.6
36.9
3
Wild buckwheat
52.2
11.4
21.9
1.3
2.6
17.2
33.4
4
Wild oats
31.4
8.2
26.1
1.3
4.2
47.0
24.4
5
Kochia
35.8
7.7
21.6
1.0
2.9
33.6
23.4
6
Lamb's-quarters
33.5
8.2
24.5
0.9
2.7
21.8
22.5
7
Canola (Argentine)
20.5
8.0
39.2
1.1
5.6
32.4
20.4
8
Chickweed
7.8
1.9
24.2
2.7
34.7
206.0
19.4
9
Round-leaved mallow
28.0
5.7
20.3
0.5
1.7
11.0
16.0
10
Canada thistle
15.1
3.6
23.8
0.5
3.6
26.8
10.8
11
Shepherd's-purse
9.9
2.4
23.9
0.3
3.0
15.8
6.8
12
Quack grass
6.0
1.9
31.0
0.5
8.2
28.4
6.3
13
Alfalfa
12.5
1.8
14.8
0.1
1.0
3.6
5.9
14
Annual sow-thistle
9.1
1.8
20.0
0.1
0.9
1.8
4.8
15
Prostrate knotweed
6.2
0.8
12.3
0.1
1.2
4.2
2.9
16
Perennial sow-thistle
6.5
0.7
11.0
0.1
1.0
2.2
2.8
17
Stork's-bill
6.2
0.7
11.2
< 0.1
0.6
1.6
2.6
18
Wheat
1.3
1.0
75.0
0.2
13.4
13.4
2.4
19
Cleavers
3.9
1.0
25.0
< 0.1
1.2
2.4
2.3
20
Prickly lettuce
2.6
0.8
30.0
0.1
2.8
5.4
1.9
21
Stinkweed
4.7
0.4
9.5
< 0.1
0.6
1.6
1.8
22
Russian thistle
2.6
0.5
17.5
< 0.1
1.8
3.4
1.4
23
Field bindweed
2.6
0.4
15.0
< 0.1
0.8
1.2
1.2
24
Corn spurry
2.6
0.2
7.5
< 0.1
0.3
0.4
0.9
25
Wild tomato
1.3
0.2
15.0
< 0.1
1.4
1.4
0.6
26
Green foxtail
1.3
0.1
10.0
< 0.1
1.0
1.0
0.5
27
Pale smartweed
1.3
0.1
10.0
< 0.1
1.0
1.0
0.5
28
Flixweed
1.3
0.1
5.0
< 0.1
0.2
0.2
0.4