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Field Survey Summary Tables – Lethbridge County
109
Table 118. 2009 irrigated spring wheat in Lethbridge County (43 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild buckwheat
61.3
22.4
36.5
3.3
5.4
28.0
50.8
2
Canola (Argentine)
37.2
15.9
42.8
2.8
7.4
36.4
36.3
3
Wild oats
44.7
12.2
27.2
2.5
5.7
47.0
33.9
4
Redroot pigweed
28.2
10.1
35.9
3.2
11.3
73.4
31.0
5
Kochia
39.1
8.7
22.4
2.1
5.3
89.6
27.4
6
Round-leaved mallow
32.0
8.5
26.7
1.2
3.8
28.6
21.3
7
Dandelion
41.7
7.0
16.7
0.6
1.5
11.0
19.7
8
Annual sow-thistle
17.3
8.0
46.4
1.5
8.7
27.2
18.6
9
Canada thistle
18.4
5.7
30.9
0.7
3.9
13.2
13.0
10
Lamb's-quarters
18.4
5.6
30.5
0.7
3.7
11.8
12.8
11
Spiny annual sow-thistle
1.9
1.9 100.0
1.1
57.6
57.6
7.3
12
Perennial sow-thistle
4.9
2.1
42.9
0.4
8.1
19.6
4.9
13
Quack grass
5.7
1.2
21.7
0.4
7.9
22.0
4.6
14
Pale smartweed
7.6
1.2
16.3
0.1
1.1
2.0
3.4
15
Stork's-bill
6.0
0.9
15.0
0.1
0.9
1.6
2.6
16
Cleavers
3.0
1.3
45.0
0.1
2.4
2.4
2.3
17
Alfalfa
6.8
0.4
6.4
< 0.1
0.3
0.4
2.2
18
Prostrate knotweed
4.9
0.8
16.9
< 0.1
0.8
1.2
2.2
19
Shepherd's-purse
3.0
0.7
25.0
0.1
3.0
3.0
1.8
20
Chickweed
4.9
0.4
8.9
< 0.1
0.4
0.6
1.7
21
Green foxtail
3.0
0.3
10.0
< 0.1
1.0
1.0
1.2
22
Field bindweed
1.9
0.6
30.0
< 0.1
1.6
1.6
1.1