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Field Survey Summary Tables – Vulcan County
127
Table 146. 2009 irrigated fields in Vulcan County (25 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Wild oats
32.0
14.6
45.6
4.1
12.9
49.2
39.9
2
Dandelion
40.0
14.6
36.5
2.5
6.3
16.6
33.6
3
Wild buckwheat
44.0
11.2
25.5
1.0
2.3
7.8
24.1
4
Smooth brome
12.0
6.2
51.7
2.8
23.4
61.6
21.9
5
Wheat
20.0
8.8
44.0
2.0
9.8
30.0
21.5
6
Perennial sow-thistle
24.0
10.0
41.7
1.3
5.5
15.6
20.2
7
Canola (Argentine)
20.0
11.0
55.0
1.3
6.5
15.4
20.0
8
Kochia
32.0
6.0
18.8
0.9
2.9
13.6
16.8
9
Canada thistle
28.0
4.6
16.4
0.3
1.1
2.4
11.5
10
Persian darnel
12.0
5.4
45.0
0.8
6.8
15.2
11.2
11
Stinkweed
20.0
4.8
24.0
0.4
1.9
4.6
10.3
12
Lamb's-quarters
20.0
2.8
14.0
0.2
1.2
4.8
7.9
13
Foxtail barley
20.0
2.0
10.0
0.1
0.7
1.6
6.8
14
Redroot pigweed
16.0
1.6
10.0
0.2
1.3
3.0
6.0
15
Shepherd's-purse
8.0
3.0
37.5
0.3
3.8
4.2
5.8
16
Tartary buckwheat
12.0
2.0
16.7
0.2
1.4
2.2
5.2
17
Green foxtail
8.0
2.8
35.0
0.2
2.5
4.4
5.1
18
Spiny annual sow-thistle
8.0
2.0
25.0
0.3
3.7
6.2
4.9
19
Wild mustard
4.0
3.0
75.0
0.2
5.6
5.6
4.5
20
Quack grass
8.0
1.6
20.0
0.2
2.4
3.6
4.1
21
Chickweed
8.0
1.0
12.5
0.1
1.5
2.4
3.2
22
Annual sow-thistle
8.0
0.6
7.5
0.1
0.9
1.6
2.7
23
Cleavers
4.0
1.2
30.0
0.1
1.8
1.8
2.2
24
Russian thistle
4.0
0.6
15.0
< 0.1
1.2
1.2
1.6
25
Alfalfa
4.0
0.4
10.0
< 0.1
0.6
0.6
1.3
26
Downy brome
4.0
0.2
5.0
< 0.1
0.4
0.4
1.1
27
Barnyard grass
4.0
0.2
5.0
< 0.1
0.4
0.4
1.1
28
Rough cinquefoil
4.0
0.2
5.0
< 0.1
0.2
0.2
1.1
29
Flixweed
4.0
0.2
5.0
< 0.1
0.2
0.2
1.1
30
Round-leaved mallow
4.0
0.2
5.0
< 0.1
0.2
0.2
1.1
31
Ball mustard
4.0
0.2
5.0
< 0.1
0.2
0.2
1.1
32
Pale smartweed
4.0
0.2
5.0
< 0.1
0.2
0.2
1.1