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Field Survey Summary Tables – Lethbridge County
112
Table 123. 2009 irrigated perennial crops in Lethbridge County (14 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
60.7
31.6
52.0
7.8
12.9
45.4
154.0
2
Redroot pigweed
19.2
5.7
29.9
1.0
5.1
11.0
27.3
3
Wild buckwheat
22.3
5.6
25.1
0.6
2.7
9.8
25.0
4
Canada thistle
30.8
3.2
10.5
0.2
0.6
1.0
20.8
5
Lamb's-quarters
22.3
3.3
14.6
0.3
1.3
4.8
18.0
6
Shepherd's-purse
10.7
2.7
25.0
0.2
1.9
3.4
11.2
7
Prostrate knotweed
5.4
2.4
45.0
0.2
4.2
4.2
8.6
8
Alfalfa
13.8
0.7
5.0
< 0.1
0.2
0.2
7.5
9
Pale smartweed
5.4
1.3
25.0
0.1
2.0
2.0
5.6
10
Kochia
8.5
0.4
5.0
< 0.1
0.4
0.4
4.7
11
Russian thistle
8.5
0.4
5.0
< 0.1
0.2
0.2
4.6
12
Barnyard grass
5.4
0.5
10.0
< 0.1
0.6
0.6
3.6
13
Quack grass
5.4
0.3
5.0
< 0.1
0.8
0.8
3.2
14
Field dock
5.4
0.3
5.0
< 0.1
0.2
0.2
2.9
15
Canola (Argentine)
5.4
0.3
5.0
< 0.1
0.2
0.2
2.9