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Field Survey Summary Tables – St. Mary River Irrigation District
161
Table 193. 2009 irrigated alfalfa in St. Mary River Irrigation District (16 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
80.6
48.8
60.5
19.4
24.0
73.8
105.8
2
Green foxtail
15.1
10.6
70.0
7.3
48.2
84.6
30.3
3
Wild buckwheat
19.4
15.2
78.7
2.6
13.3
15.8
22.8
4
Redroot pigweed
31.2
9.2
29.4
2.1
6.8
26.4
19.9
5
Lamb's-quarters
34.5
9.1
26.4
1.7
5.0
19.0
19.6
6
Stinkweed
15.1
6.8
45.0
2.3
15.0
28.2
14.6
7
Canada thistle
37.8
4.3
11.3
0.4
1.0
3.8
13.3
8
Field bindweed
22.7
3.8
16.7
0.6
2.6
6.2
9.8
9
Perennial sow-thistle
15.1
3.4
22.5
0.5
3.1
4.6
7.4
10
Quack grass
15.1
1.9
12.5
0.1
0.8
1.2
5.4
11
Kochia
13.0
1.5
11.3
0.3
2.4
5.4
5.0
12
Pale smartweed
11.8
2.2
18.6
0.2
1.6
2.0
5.0
13
Wild oats
7.6
1.9
25.0
0.6
7.6
7.6
4.7
14
Shepherd's-purse
8.5
2.1
25.0
0.2
1.9
3.4
4.1
15
Yellow sweet-clover
10.9
1.4
12.5
0.1
0.8
1.4
3.9
16
Barnyard grass
7.6
1.9
25.0
0.1
1.2
1.2
3.5
17
Wheat
7.6
1.1
15.0
0.2
3.2
3.2
3.3
18
Prostrate knotweed
4.2
1.9
45.0
0.2
4.2
4.2
2.9
19
Foxtail barley
5.4
1.1
20.0
0.2
3.0
3.0
2.6
20
Wild mustard
7.6
0.8
10.0
< 0.1
0.6
0.6
2.5
21
Broad-leaved plantain
7.6
0.4
5.0
< 0.1
0.4
0.4
2.2
22
Goat's-beard
5.4
0.8
15.0
0.1
1.8
1.8
2.2
23
White cockle
7.6
0.4
5.0
< 0.1
0.2
0.2
2.1
24
Prickly lettuce
7.6
0.4
5.0
< 0.1
0.2
0.2
2.1
25
Spiny annual sow-thistle
7.6
0.4
5.0
< 0.1
0.2
0.2
2.1
26
Bull thistle
5.4
0.3
5.0
< 0.1
0.4
0.4
1.6
27
Canola (Argentine)
4.2
0.2
5.0
< 0.1
0.2
0.2
1.2