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Field Survey Summary Tables – Ecodistricts 812 & 806
81
Table 75. 2009 irrigated perennial crops in the Brooks Plain & Berry Creek Plain Ecodistricts (812 & 806)
in the Mixed Grassland Ecoregion (48 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
93.8
61.6
65.7
12.6
13.5
51.6
172.2
2
Canada thistle
33.3
6.4
19.1
0.5
1.5
9.4
21.8
3
Smooth brome
20.8
5.8
28.0
1.0
4.9
30.6
19.7
4
Lamb's-quarters
18.8
4.5
23.9
0.9
4.7
31.2
16.6
5
Kochia
18.8
3.5
18.9
0.9
4.6
31.4
15.5
6
Quack grass
12.5
2.3
18.3
0.4
2.9
13.0
9.1
7
Wild buckwheat
8.3
1.9
22.5
0.1
1.6
2.6
5.8
8
Perennial sow-thistle
6.3
2.1
33.3
0.2
3.1
7.6
5.6
9
Wild oats
10.4
1.1
11.0
0.1
0.7
1.8
5.4
10
Barnyard grass
6.3
1.7
26.7
0.2
3.0
5.2
5.1
11
Narrow-leaved hawk's-beard
6.3
1.7
26.7
0.1
1.5
2.2
4.6
12
Foxtail barley
6.3
0.4
6.7
< 0.1
0.5
0.8
2.9
13
Annual sow-thistle
4.2
0.7
17.5
0.1
1.3
2.4
2.6
14
Spiny annual sow-thistle
4.2
0.5
12.5
< 0.1
0.7
0.8
2.2
15
Shepherd's-purse
4.2
0.3
7.5
< 0.1
0.5
0.8
2.0
16
Redroot pigweed
4.2
0.3
7.5
< 0.1
0.4
0.4
1.9
17
Curled dock
4.2
0.3
7.5
< 0.1
0.3
0.4
1.9
18
Russian thistle
4.2
0.2
5.0
< 0.1
0.2
0.2
1.8
19
White sweet-clover
2.1
0.3
15.0
< 0.1
2.0
2.0
1.3
20
Round-leaved mallow
2.1
0.1
5.0
< 0.1
0.2
0.2
0.9
21
Broad-leaved plantain
2.1
0.1
5.0
< 0.1
0.2
0.2
0.9
Table 76. 2009 irrigated alfalfa in the Brooks Plain & Berry Creek Plain Ecodistricts (812 & 806) in the
Mixed Grassland Ecoregion (40 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Dandelion
95.0
62.6
65.9
12.1
12.7
48.6
164.4
2
Canada thistle
35.0
7.1
20.4
0.6
1.7
9.4
22.5
3
Smooth brome
22.5
6.4
28.3
1.2
5.2
30.6
20.8
4
Lamb's-quarters
20.0
5.1
25.6
1.0
5.2
31.2
17.9
5
Kochia
22.5
4.3
18.9
1.0
4.6
31.4
17.9
6
Quack grass
15.0
2.8
18.3
0.4
2.9
13.0
10.4
7
Perennial sow-thistle
7.5
2.5
33.3
0.2
3.1
7.6
6.4
8
Wild oats
12.5
1.4
11.0
0.1
0.7
1.8
6.2
9
Barnyard grass
7.5
2.0
26.7
0.2
3.0
5.2
5.9
10
Narrow-leaved hawk's-beard
7.5
2.0
26.7
0.1
1.5
2.2
5.2
11
Wild buckwheat
7.5
1.6
21.7
0.1
1.7
2.6
4.9
12
Foxtail barley
7.5
0.5
6.7
< 0.1
0.5
0.8
3.3
13
Annual sow-thistle
5.0
0.9
17.5
0.1
1.3
2.4
3.0
14
Spiny annual sow-thistle
5.0
0.6
12.5
< 0.1
0.7
0.8
2.5
15
Shepherd's-purse
5.0
0.4
7.5
< 0.1
0.5
0.8
2.2
16
Redroot pigweed
5.0
0.4
7.5
< 0.1
0.4
0.4
2.2
17
Curled dock
5.0
0.4
7.5
< 0.1
0.3
0.4
2.2
18
Round-leaved mallow
2.5
0.1
5.0
< 0.1
0.2
0.2
1.0
19
Russian thistle
2.5
0.1
5.0
< 0.1
0.2
0.2
1.0