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Field Survey Summary Tables – Eastern Irrigation District
146
Table 172. 2009 irrigated alfalfa in Eastern Irrigation District (43 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
95.3
62.1
65.1
11.8
12.3
48.6
164.6
2
Canada thistle
37.2
6.9
18.4
0.6
1.5
9.4
22.9
3
Smooth brome
20.9
5.9
28.3
1.1
5.2
30.6
19.6
4
Kochia
20.9
4.0
18.9
1.0
4.6
31.4
16.8
5
Lamb's-quarters
18.6
4.8
25.6
1.0
5.2
31.2
16.8
6
Quack grass
11.6
2.3
20.0
0.5
3.9
13.0
9.0
7
Perennial sow-thistle
7.0
2.3
33.3
0.2
3.1
7.6
6.0
8
Wild oats
11.6
1.3
11.0
0.1
0.7
1.8
5.7
9
Barnyard grass
7.0
1.9
26.7
0.2
3.0
5.2
5.5
10
Narrow-leaved hawk's-beard
7.0
1.9
26.7
0.1
1.5
2.2
4.9
11
Wild buckwheat
7.0
1.5
21.7
0.1
1.7
2.6
4.6
12
Shepherd's-purse
7.0
0.6
8.3
< 0.1
0.5
0.8
3.2
13
Foxtail barley
7.0
0.5
6.7
< 0.1
0.5
0.8
3.1
14
Annual sow-thistle
4.7
0.8
17.5
0.1
1.3
2.4
2.8
15
Spiny annual sow-thistle
4.7
0.6
12.5
< 0.1
0.7
0.8
2.4
16
Redroot pigweed
4.7
0.3
7.5
< 0.1
0.4
0.4
2.0
17
Green foxtail
2.3
0.7
30.0
0.1
4.0
4.0
2.0
18
Curled dock
4.7
0.3
7.5
< 0.1
0.3
0.4
2.0
19
Russian thistle
4.7
0.2
5.0
< 0.1
0.2
0.2
1.9
20
Common burdock
2.3
0.2
10.0
< 0.1
1.4
1.4
1.2
21
Silver sagebrush
2.3
0.2
10.0
< 0.1
0.4
0.4
1.1
22
Showy milkweed
2.3
0.1
5.0
< 0.1
0.4
0.4
1.0
23
Round-leaved mallow
2.3
0.1
5.0
< 0.1
0.2
0.2
0.9