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Field Survey Summary Tables – Lethbridge Northern Irrigation District
149
Table 175. 2009 irrigated cereal crops in Lethbridge Northern Irrigation District (59 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Redroot pigweed
49.3
16.5
33.5
4.6
9.4
73.4
51.3
2
Wild buckwheat
60.7
14.3
23.6
1.7
2.9
17.2
36.4
3
Wild oats
40.0
10.2
25.5
1.7
4.2
47.0
27.5
4
Kochia
41.0
9.5
23.3
1.2
2.9
33.6
24.6
5
Canola (Argentine)
27.2
10.7
39.2
1.5
5.6
32.4
24.2
6
Chickweed
10.3
2.5
24.2
3.6
34.7
206.0
23.7
7
Lamb's-quarters
39.3
9.3
23.8
1.1
2.7
21.8
23.2
8
Round-leaved mallow
35.5
7.5
21.0
0.6
1.7
11.0
18.3
9
Dandelion
32.1
7.0
21.7
0.7
2.3
13.4
17.7
10
Quack grass
8.0
2.5
31.0
0.7
8.2
28.4
7.6
11
Canada thistle
12.1
2.8
23.6
0.3
2.4
10.8
6.9
12
Shepherd's-purse
10.0
2.9
28.9
0.4
3.6
15.8
6.9
13
Alfalfa
14.9
2.4
15.9
0.2
1.1
3.6
6.4
14
Annual sow-thistle
10.3
2.2
20.8
0.1
0.9
1.8
4.9
15
Prostrate knotweed
8.3
1.0
12.3
0.1
1.2
4.2
3.3
16
Perennial sow-thistle
8.6
0.9
11.0
0.1
1.0
2.2
3.3
17
Stork's-bill
8.3
0.9
11.2
< 0.1
0.6
1.6
3.0
18
Prickly lettuce
3.4
1.0
30.0
0.1
2.8
5.4
2.3
19
Stinkweed
6.2
0.6
9.5
< 0.1
0.6
1.6
2.2
20
Cleavers
3.4
0.9
25.0
< 0.1
1.3
2.4
1.8
21
Field bindweed
3.4
0.5
15.0
< 0.1
0.8
1.2
1.4
22
Wild tomato
1.7
0.3
15.0
< 0.1
1.4
1.4
0.8
23
Green foxtail
1.7
0.2
10.0
< 0.1
1.0
1.0
0.6
24
Pale smartweed
1.7
0.2
10.0
< 0.1
1.0
1.0
0.6
25
Corn spurry
1.7
0.2
10.0
< 0.1
0.4
0.4
0.6
26
Flixweed
1.7
0.1
5.0
< 0.1
0.2
0.2
0.5
Table 176. 2009 irrigated spring wheat in Lethbridge Northern Irrigation District (18 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Canola (Argentine)
44.9
21.3
47.5
3.5
7.8
32.4
54.9
2
Wild oats
49.5
16.5
33.4
3.8
7.7
47.0
53.9
3
Wild buckwheat
61.8
20.5
33.2
2.6
4.2
16.8
52.0
4
Kochia
44.9
9.8
21.9
0.5
1.2
2.8
23.8
5
Dandelion
39.3
7.6
19.3
0.8
2.1
11.0
22.5
6
Redroot pigweed
28.1
5.3
19.0
0.6
2.3
5.8
16.3
7
Lamb's-quarters
16.8
6.5
38.3
0.8
4.8
11.8
15.7
8
Round-leaved mallow
28.1
5.9
21.0
0.3
1.0
2.0
14.4
9
Canada thistle
16.8
5.9
35.0
0.7
4.1
10.8
14.3
10
Annual sow-thistle
11.2
3.4
30.0
0.1
1.2
1.6
6.8
11
Stork's-bill
11.2
1.7
15.0
0.1
0.9
1.6
5.0
12
Cleavers
5.6
2.5
45.0
0.1
2.4
2.4
4.6
13
Shepherd's-purse
5.6
1.4
25.0
0.2
3.0
3.0
3.8
14
Prostrate knotweed
5.6
0.8
15.0
< 0.1
0.6
0.6
2.4
15
Green foxtail
5.6
0.6
10.0
0.1
1.0
1.0
2.3
16
Perennial sow-thistle
5.6
0.6
10.0
< 0.1
0.8
0.8
2.2
17
Chickweed
5.6
0.3
5.0
< 0.1
0.2
0.2
1.7
18
Alfalfa
5.6
0.3
5.0
< 0.1
0.2
0.2
1.7
19
Quack grass
4.6
0.2
5.0
< 0.1
0.2
0.2
1.4