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Field Survey Summary Tables – Ecodistrict 793
71
Table 60. 2009 irrigated spring wheat in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed
Grassland Ecoregion (43 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild buckwheat
53.7
19.7
36.7
2.7
5.1
25.6
47.2
2
Canola (Argentine)
39.0
15.8
40.5
2.7
7.0
36.4
39.7
3
Wild oats
45.1
12.0
26.7
2.5
5.5
47.0
36.5
4
Redroot pigweed
24.8
9.8
39.6
3.1
12.6
73.4
32.5
5
Kochia
39.6
8.4
21.1
2.0
5.1
89.6
29.1
6
Round-leaved mallow
31.5
8.4
26.7
1.2
3.8
28.6
22.6
7
Annual sow-thistle
17.1
7.9
46.4
1.5
8.7
27.2
19.9
8
Canada thistle
22.3
6.8
30.6
0.8
3.6
13.2
16.6
9
Dandelion
38.7
4.9
12.6
0.3
0.8
2.0
16.4
10
Lamb's-quarters
13.3
3.4
25.4
0.3
2.1
7.2
8.1
11
Quack grass
8.0
1.3
16.7
0.4
5.6
22.0
5.7
12
Perennial sow-thistle
4.8
2.1
42.9
0.4
8.1
19.6
5.3
13
Field bindweed
7.8
1.3
17.2
0.1
0.9
1.6
3.7
14
Foxtail barley
1.7
0.7
40.0
0.3
15.2
15.2
2.5
15
Pale smartweed
5.6
0.8
15.0
< 0.1
0.8
1.2
2.5
16
Cleavers
2.9
1.3
45.0
0.1
2.4
2.4
2.4
17
Prostrate knotweed
4.8
0.8
16.9
< 0.1
0.8
1.2
2.2
18
Alfalfa
5.4
0.4
6.7
< 0.1
0.3
0.4
1.8
19
Chickweed
4.8
0.4
8.9
< 0.1
0.4
0.6
1.8
20
Downy brome
3.5
0.3
10.0
< 0.1
0.4
0.4
1.3
21
Green foxtail
2.9
0.3
10.0
< 0.1
1.0
1.0
1.2
22
Stork's-bill
2.9
0.1
5.0
< 0.1
0.2
0.2
0.9