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Field Survey Summary Tables – St. Mary River Irrigation District
156
Table 185. 2009 irrigated spring wheat in St. Mary River Irrigation District (60 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild buckwheat
51.9
15.0
28.8
2.2
4.3
28.0
45.2
2
Kochia
48.8
10.2
20.9
2.7
5.6
89.6
41.9
3
Wild oats
60.4
8.4
13.9
1.0
1.6
8.2
31.0
4
Redroot pigweed
24.9
7.0
28.1
2.2
8.9
73.4
28.8
5
Lamb's-quarters
38.3
6.4
16.7
0.8
2.2
19.8
22.4
6
Round-leaved mallow
21.8
5.1
23.4
0.8
3.8
28.6
16.7
7
Canada thistle
28.8
4.1
14.1
0.4
1.4
13.2
14.4
8
Annual sow-thistle
9.8
4.4
45.3
1.0
10.3
27.2
14.3
9
Dandelion
25.1
4.4
17.6
0.3
1.3
3.6
13.5
10
Stinkweed
18.5
1.9
10.2
1.0
5.5
41.4
13.3
11
Canola (Argentine)
17.5
3.6
20.4
0.6
3.7
36.4
12.7
12
Spiny annual sow-thistle
1.3
1.3 100.0
0.8
57.6
57.6
6.8
13
Pale smartweed
9.9
1.2
12.1
0.1
1.0
2.0
4.5
14
Perennial sow-thistle
3.2
1.3
41.7
0.3
8.4
19.6
4.2
15
Quack grass
3.9
0.9
21.7
0.3
7.9
22.0
4.0
16
Green foxtail
6.6
1.0
15.0
0.1
2.3
4.4
3.7
17
Flixweed
10.0
0.7
7.1
< 0.1
0.5
1.2
3.5
18
Foxtail barley
3.4
0.3
7.5
0.3
7.8
15.0
2.8
19
Field bindweed
7.0
0.7
9.7
< 0.1
0.5
1.6
2.7
20
Alfalfa
5.0
0.5
11.0
< 0.1
0.6
1.0
2.1
21
Shepherd's-purse
4.7
0.5
10.0
< 0.1
0.5
0.6
1.8
22
Cow cockle
1.9
0.7
35.0
< 0.1
1.8
1.8
1.5
23
Wild tomato
3.8
0.3
7.5
< 0.1
0.8
1.2
1.4
24
Downy brome
1.9
0.3
15.0
< 0.1
0.6
0.6
0.9
25
Broad-leaved plantain
2.3
0.1
5.0
< 0.1
0.4
0.4
0.8
26
Prostrate knotweed
1.3
0.3
20.0
< 0.1
1.2
1.2
0.7
27
Russian thistle
1.9
0.2
10.0
< 0.1
0.4
0.4
0.7
28
Goat's-beard
2.3
0.1
5.0
< 0.1
0.2
0.2
0.7
29
Wild mustard
2.3
0.1
5.0
< 0.1
0.2
0.2
0.7
30
Stork's-bill
2.3
0.1
5.0
< 0.1
0.2
0.2
0.7
31
Timothy
1.7
0.2
10.0
< 0.1
0.6
0.6
0.7
32
Chickweed
1.3
0.2
15.0
< 0.1
0.6
0.6
0.6