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Field Survey Summary Tables – St. Mary River Irrigation District
154
Table 183. 2009 irrigated annual crops in St. Mary River Irrigation District (155 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild buckwheat
48.5
12.4
25.5
1.4
2.8
28.0
43.8
2
Redroot pigweed
23.6
7.6
32.4
2.2
9.1
73.4
35.9
3
Kochia
44.3
7.4
16.7
1.3
3.0
89.6
34.9
4
Wild oats
37.3
7.9
21.3
1.2
3.2
34.6
32.3
5
Lamb's-quarters
28.5
5.7
20.1
1.0
3.6
35.8
25.3
6
Round-leaved mallow
23.7
4.6
19.2
0.5
1.9
28.6
17.5
7
Dandelion
18.5
3.3
17.9
0.3
1.4
7.4
12.5
8
Canola (Argentine)
12.4
3.2
26.0
0.5
3.9
36.4
12.4
9
Canada thistle
18.5
2.8
15.3
0.3
1.8
13.2
12.4
10
Annual sow-thistle
9.4
2.8
29.9
0.5
4.9
27.2
10.6
11
Alfalfa
4.7
1.5
32.3
0.6
13.4
106.2
8.8
12
Stinkweed
9.4
1.0
10.5
0.4
4.5
41.4
7.8
13
Chickweed
2.1
0.7
35.0
0.7
35.3
139.2
7.6
14
Green foxtail
7.3
1.2
16.2
0.2
2.9
13.0
5.6
15
Quack grass
3.6
1.0
27.1
0.2
6.2
22.0
4.3
16
Spiny annual sow-thistle
0.5
0.5 100.0
0.3
57.6
57.6
3.3
17
Pale smartweed
5.8
0.6
10.5
0.1
0.9
2.0
3.1
18
Perennial sow-thistle
1.8
0.6
31.1
0.1
6.0
19.6
2.2
19
Foxtail barley
2.7
0.2
7.6
0.1
4.1
15.0
2.0
20
Flixweed
3.9
0.3
7.1
< 0.1
0.5
1.2
1.7
21
Field bindweed
3.4
0.3
9.7
< 0.1
0.5
1.6
1.6
22
Wild tomato
3.5
0.2
7.1
< 0.1
0.8
1.4
1.6
23
Downy brome
2.3
0.4
16.1
< 0.1
1.2
1.6
1.5
24
Prostrate knotweed
1.0
0.4
40.0
< 0.1
4.4
7.6
1.3
25
Shepherd's-purse
2.4
0.2
10.0
< 0.1
0.5
0.6
1.1
26
Cleavers
1.0
0.4
40.0
< 0.1
2.7
3.6
1.1
27
Stork's-bill
2.5
0.2
7.1
< 0.1
0.3
0.6
1.0
28
Wheat
1.7
0.2
12.6
< 0.1
1.5
2.4
1.0
29
Barnyard grass
1.4
0.2
12.2
< 0.1
2.4
6.2
1.0
30
Cow cockle
0.7
0.3
35.0
< 0.1
1.8
1.8
0.7
31
Russian thistle
1.5
0.1
7.5
< 0.1
0.3
0.4
0.6
32
Goat's-beard
1.6
0.1
5.0
< 0.1
0.2
0.2
0.6
33
Prostrate pigweed
0.7
0.1
15.0
< 0.1
0.6
0.6
0.4
34
Barley
0.7
0.1
15.0
< 0.1
0.6
0.6
0.4
35
Broad-leaved plantain
0.9
< 0.1
5.0
< 0.1
0.4
0.4
0.4
36
Wild mustard
0.9
< 0.1
5.0
< 0.1
0.2
0.2
0.4
37
Timothy
0.7
0.1
10.0
< 0.1
0.6
0.6
0.3
38
Prickly lettuce
0.5
0.1
15.0
< 0.1
0.6
0.6
0.3
39
Corn
0.5
0.1
10.0
< 0.1
0.4
0.4
0.2
40
Millet
0.5
< 0.1
5.0
< 0.1
0.2
0.2
0.2