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Field Survey Summary Tables – Lethbridge Northern Irrigation District
148
Table 174. 2009 irrigated annual crops in Lethbridge Northern Irrigation District (66 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
50.1
15.4
30.6
4.2
8.3
73.4
51.2
2
Wild buckwheat
58.8
13.2
22.4
1.6
2.7
17.2
36.0
3
Wild oats
37.3
9.7
26.1
1.6
4.2
47.0
27.4
4
Kochia
39.7
8.8
22.2
1.1
2.7
33.6
24.4
5
Lamb's-quarters
36.6
9.6
26.1
1.1
2.9
21.8
24.2
6
Canola (Argentine)
24.3
9.5
39.2
1.3
5.6
32.4
23.0
7
Chickweed
9.2
2.2
24.2
3.2
34.7
206.0
22.8
8
Round-leaved mallow
33.2
6.7
20.3
0.6
1.7
11.0
17.7
9
Dandelion
28.6
6.2
21.7
0.7
2.3
13.4
16.7
10
Quack grass
7.1
2.2
31.0
0.6
8.2
28.4
7.2
11
Shepherd's-purse
10.5
2.7
26.1
0.3
3.3
15.8
7.2
12
Canada thistle
10.8
2.5
23.6
0.3
2.4
10.8
6.6
13
Alfalfa
13.3
2.1
15.9
0.1
1.1
3.6
6.1
14
Annual sow-thistle
10.8
2.2
20.0
0.1
0.9
1.8
5.2
15
Prostrate knotweed
7.4
0.9
12.3
0.1
1.2
4.2
3.2
16
Perennial sow-thistle
7.7
0.8
11.0
0.1
1.0
2.2
3.1
17
Stork's-bill
7.4
0.8
11.2
< 0.1
0.6
1.6
2.8
18
Wheat
1.5
1.2
75.0
0.2
13.4
13.4
2.7
19
Cleavers
4.6
1.2
25.0
0.1
1.2
2.4
2.6
20
Prickly lettuce
3.1
0.9
30.0
0.1
2.8
5.4
2.1
21
Stinkweed
5.6
0.5
9.5
< 0.1
0.6
1.6
2.0
22
Field bindweed
3.1
0.5
15.0
< 0.1
0.8
1.2
1.3
23
Russian thistle
1.5
0.5
30.0
0.1
3.4
3.4
1.1
24
Corn spurry
3.1
0.2
7.5
< 0.1
0.3
0.4
1.0
25
Wild tomato
1.5
0.2
15.0
< 0.1
1.4
1.4
0.7
26
Green foxtail
1.5
0.2
10.0
< 0.1
1.0
1.0
0.6
27
Pale smartweed
1.5
0.2
10.0
< 0.1
1.0
1.0
0.6
28
Flixweed
1.5
0.1
5.0
< 0.1
0.2
0.2
0.5