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Field Survey Summary Tables – St. Mary River Irrigation District
160
Table 192. 2009 irrigated perennial crops in St. Mary River Irrigation District (24 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
74.3
44.9
60.3
17.2
23.2
73.8
114.9
2
Green foxtail
10.5
7.3
70.0
5.0
48.2
84.6
25.3
3
Wild buckwheat
17.2
12.2
71.3
1.9
11.2
15.8
21.8
4
Lamb's-quarters
28.1
6.9
24.6
1.2
4.4
19.0
17.9
5
Redroot pigweed
21.6
6.3
29.4
1.5
6.8
26.4
16.3
6
Canada thistle
34.2
4.4
12.8
0.4
1.1
3.8
14.7
7
Stinkweed
10.5
4.7
45.0
1.6
15.0
28.2
12.1
8
Foxtail barley
11.3
3.0
26.7
0.8
6.9
12.8
8.3
9
Field bindweed
15.7
2.6
16.7
0.4
2.6
6.2
8.0
10
Perennial sow-thistle
10.5
2.4
22.5
0.3
3.1
4.6
6.1
11
Wild oats
9.5
2.2
22.8
0.4
4.6
7.6
6.0
12
Kochia
13.2
1.2
9.3
0.2
1.7
5.4
5.5
13
Quack grass
13.4
1.5
10.9
0.1
0.8
1.2
5.4
14
Pale smartweed
8.2
1.5
18.6
0.1
1.6
2.0
4.1
15
Barnyard grass
8.2
1.6
19.6
0.1
1.0
1.2
4.0
16
Shepherd's-purse
5.9
1.5
25.0
0.1
1.9
3.4
3.3
17
Yellow sweet-clover
7.5
0.9
12.5
0.1
0.8
1.4
3.1
18
Canola (Argentine)
7.2
0.8
10.9
< 0.1
0.6
0.8
2.8
19
Wheat
5.2
0.8
15.0
0.2
3.2
3.2
2.7
20
Prostrate knotweed
2.9
1.3
45.0
0.1
4.2
4.2
2.4
21
Wild mustard
5.2
0.5
10.0
< 0.1
0.6
0.6
2.0
22
Goat's-beard
3.8
0.6
15.0
0.1
1.8
1.8
1.8
23
Broad-leaved plantain
5.2
0.3
5.0
< 0.1
0.4
0.4
1.8
24
White cockle
5.2
0.3
5.0
< 0.1
0.2
0.2
1.7
25
Prickly lettuce
5.2
0.3
5.0
< 0.1
0.2
0.2
1.7
26
Spiny annual sow-thistle
5.2
0.3
5.0
< 0.1
0.2
0.2
1.7
27
White clover
3.8
0.4
10.0
< 0.1
0.6
0.6
1.5
28
Bull thistle
3.8
0.2
5.0
< 0.1
0.4
0.4
1.3
29
Field dock
2.9
0.1
5.0
< 0.1
0.2
0.2
1.0
30
Alfalfa
2.9
0.1
5.0
< 0.1
0.2
0.2
1.0