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Field Survey Summary Tables – Ecodistrict 793
74
Table 65. 2009 irrigated perennial crops in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed
Grassland Ecoregion (25 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
65.7
45.7
69.6
12.0
18.2
98.6
169.8
2
Canada thistle
34.3
7.0
20.3
1.2
3.4
26.8
31.7
3
Lamb's-quarters
22.0
3.8
17.2
0.2
1.1
4.8
16.0
4
Redroot pigweed
15.1
3.2
21.3
0.5
3.4
11.0
14.2
5
Wild buckwheat
11.6
2.9
25.1
0.3
2.7
9.8
10.9
6
Kochia
13.2
1.2
9.1
0.4
3.0
10.2
9.7
7
Shepherd's-purse
9.1
1.6
17.2
0.1
1.5
3.4
6.8
8
Stinkweed
10.4
0.8
7.5
< 0.1
0.3
0.4
5.6
9
Quack grass
8.0
0.9
11.5
0.1
0.9
1.0
5.1
10
Canola (Argentine)
8.0
0.7
8.3
< 0.1
0.3
0.4
4.4
11
Prostrate knotweed
2.8
1.2
45.0
0.1
4.2
4.2
3.7
12
Alfalfa
7.2
0.4
5.0
< 0.1
0.2
0.2
3.6
13
Flixweed
5.2
0.5
10.0
< 0.1
0.4
0.4
3.0
14
Round-leaved mallow
5.2
0.3
5.0
< 0.1
0.2
0.2
2.6
15
Black medick
5.2
0.3
5.0
< 0.1
0.2
0.2
2.6
16
Perennial sow-thistle
5.2
0.3
5.0
< 0.1
0.2
0.2
2.6
17
Pale smartweed
2.8
0.7
25.0
0.1
2.0
2.0
2.5
18
Russian thistle
4.4
0.2
5.0
< 0.1
0.2
0.2
2.2
19
Barnyard grass
2.8
0.3
10.0
< 0.1
0.6
0.6
1.6
20
Field dock
2.8
0.1
5.0
< 0.1
0.2
0.2
1.4
Table 66. 2009 irrigated alfalfa in the Lethbridge Plain (793) Ecodistrict in the Moist Mixed Grassland
Ecoregion (13 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
84.7
57.0
67.3
15.9
18.7
98.6
199.5
2
Lamb's-quarters
23.7
3.3
14.0
0.3
1.2
4.8
16.4
3
Wild buckwheat
13.7
5.1
37.4
0.6
4.3
9.8
15.9
4
Canada thistle
15.3
2.3
14.8
0.2
1.0
1.4
10.5
5
Shepherd's-purse
10.6
2.7
25.0
0.2
1.9
3.4
9.2
6
Canola (Argentine)
15.3
1.3
8.3
0.1
0.3
0.4
8.7
7
Prostrate knotweed
5.3
2.4
45.0
0.2
4.2
4.2
6.6
8
Redroot pigweed
10.6
1.1
10.0
< 0.1
0.4
0.6
6.3
9
Flixweed
10.0
1.0
10.0
< 0.1
0.4
0.4
5.9
10
Stinkweed
10.0
1.0
10.0
< 0.1
0.4
0.4
5.9
11
Round-leaved mallow
10.0
0.5
5.0
< 0.1
0.2
0.2
5.2
12
Perennial sow-thistle
10.0
0.5
5.0
< 0.1
0.2
0.2
5.2
13
Pale smartweed
5.3
1.3
25.0
0.1
2.0
2.0
4.6