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Field Survey Summary Tables – Ecodistricts 812 & 806
76
Table 68. 2009 irrigated fields in the Brooks Plain & Berry Creek Plain Ecodistricts (812 & 806) in the
Mixed Grassland Ecoregion (114 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
64.9
32.3
49.7
5.9
9.0
51.6
91.0
2
Wild buckwheat
43.0
9.9
23.0
0.6
1.5
11.2
25.8
3
Lamb's-quarters
32.5
8.3
25.7
1.2
3.7
31.2
25.5
4
Wild oats
28.1
5.6
19.8
0.9
3.3
32.6
19.4
5
Kochia
34.2
4.7
13.8
0.5
1.5
31.4
17.4
6
Redroot pigweed
21.1
3.9
18.8
0.8
3.7
58.6
15.0
7
Alfalfa
10.5
4.4
41.7
1.0
9.6
36.8
14.3
8
Canada thistle
25.4
4.8
19.0
0.3
1.3
9.4
13.9
9
Canola (Argentine)
14.0
5.0
35.3
0.7
5.1
32.4
13.7
10
Green foxtail
18.4
5.0
26.9
0.5
2.5
15.8
13.0
11
Smooth brome
11.4
3.2
27.7
0.5
4.3
30.6
9.6
12
Quack grass
7.9
1.3
16.1
0.2
3.1
13.0
5.1
13
Barnyard grass
6.1
1.6
25.7
0.2
3.2
11.8
4.6
14
Shepherd's-purse
7.9
1.1
13.9
0.1
0.9
3.0
3.7
15
Round-leaved mallow
7.0
1.2
16.9
0.1
1.3
3.4
3.7
16
Foxtail barley
6.1
0.7
11.4
0.1
1.6
5.6
3.0
17
Narrow-leaved hawk's-beard
5.3
1.1
20.8
0.1
1.2
2.2
2.9
18
Annual sow-thistle
4.4
0.9
21.0
0.1
1.4
2.4
2.5
19
Perennial sow-thistle
3.5
1.0
27.5
0.1
2.5
7.6
2.5
20
Spiny annual sow-thistle
4.4
0.8
18.0
0.1
1.2
2.8
2.3
21
Wheat
3.5
0.4
12.5
< 0.1
1.4
2.0
1.7
22
Pale smartweed
3.5
0.4
10.0
< 0.1
1.3
3.8
1.6
23
Russian thistle
4.4
0.2
5.0
< 0.1
0.2
0.4
1.4
24
Chickweed
2.6
0.3
11.7
< 0.1
0.7
1.0
1.1
25
Barley
0.9
0.4
45.0
0.1
7.4
7.4
1.1
26
Broad-leaved plantain
1.8
0.3
15.0
< 0.1
1.2
2.2
0.9
27
Stinkweed
2.6
0.1
5.0
< 0.1
0.2
0.2
0.9
28
Cleavers
1.8
0.1
7.5
< 0.1
0.3
0.4
0.6
29
Curled dock
1.8
0.1
7.5
< 0.1
0.3
0.4
0.6
30
White sweet-clover
0.9
0.1
15.0
< 0.1
2.0
2.0
0.5
31
Stork's-bill
0.9
0.1
10.0
< 0.1
0.6
0.6
0.4
32
Japanese brome
0.9
< 0.1
5.0
< 0.1
0.2
0.2
0.3