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Field Survey Summary Tables – Ecodistrict 829
97
Table 98. 2009 irrigated fields in the Purple Springs Plain Ecodistrict (829) in the Mixed Grassland
Ecoregion (35 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Kochia
34.5
4.3
12.5
0.6
1.7
5.4
42.5
2
Wild oats
17.3
2.9
16.7
0.6
3.4
6.6
30.4
3
Dandelion
25.9
3.0
11.7
0.3
1.1
2.0
27.2
4
Foxtail barley
14.4
1.7
12.0
0.6
4.3
15.0
26.5
5
Canada thistle
31.0
2.1
6.9
0.2
0.8
2.2
25.9
6
Redroot pigweed
17.3
3.0
17.5
0.3
1.5
7.6
23.0
7
Wild buckwheat
8.0
3.6
44.8
0.3
3.6
8.2
20.9
8
Pasture sage
5.8
3.2
55.0
0.3
5.7
6.8
19.7
9
Alfalfa
2.9
2.3
80.0
0.3
9.0
9.0
14.2
10
White sweet-clover
2.9
2.2
75.0
0.2
8.0
8.0
13.1
11
Lamb's-quarters
11.5
1.2
10.0
0.1
0.5
0.8
9.9
12
Goat's-beard
8.6
0.9
10.0
0.1
0.9
1.8
8.2
13
Yellow sweet-clover
8.6
0.9
10.0
0.1
0.9
2.0
8.2
14
Canola (Argentine)
5.8
1.0
17.5
< 0.1
0.8
1.0
6.6
15
Prickly rose
2.9
0.6
20.0
0.1
2.2
2.2
4.5
16
Bull thistle
5.8
0.3
5.0
< 0.1
0.3
0.4
3.9
17
Purslane
2.9
0.4
15.0
< 0.1
1.4
1.4
3.5
18
Common groundsel
2.9
0.4
15.0
< 0.1
0.8
0.8
3.1
19
Timothy
2.9
0.3
10.0
< 0.1
0.6
0.6
2.6
20
Showy milkweed
2.9
0.1
5.0
< 0.1
0.6
0.6
2.1
21
Field bindweed
2.9
0.1
5.0
< 0.1
0.2
0.2
1.9
22
White clover
2.9
0.1
5.0
< 0.1
0.2
0.2
1.9
Table 99. 2009 irrigated annual crops in the Purple Springs Plain Ecodistrict (829) in the Mixed Grassland
Ecoregion (26 fields)
Frequency Field Uniformity
Field Density (#/m
2
)
Relative
Rank Species
(%)
All Occurrence All Occurrence High Abundance
1
Kochia
38.8
4.8
12.5
0.6
1.5
3.0
56.0
2
Wild oats
23.3
3.9
16.7
0.8
3.4
6.6
49.7
3
Redroot pigweed
19.4
3.9
20.0
0.3
1.7
7.6
34.5
4
Wild buckwheat
10.8
4.8
44.8
0.4
3.6
8.2
34.3
5
Canada thistle
22.4
1.7
7.6
0.2
0.9
2.2
24.5
6
Foxtail barley
7.8
0.6
7.5
0.6
7.8
15.0
23.7
7
Alfalfa
3.9
3.1
80.0
0.3
9.0
9.0
23.2
8
Lamb's-quarters
15.5
1.6
10.0
0.1
0.5
0.8
16.7
9
Canola (Argentine)
7.8
1.4
17.5
0.1
0.8
1.0
11.1
10
Purslane
3.9
0.6
15.0
0.1
1.4
1.4
5.9
11
Common groundsel
3.9
0.6
15.0
< 0.1
0.8
0.8
5.2
12
Timothy
3.9
0.4
10.0
< 0.1
0.6
0.6
4.3
13
Dandelion
3.9
0.4
10.0
< 0.1
0.4
0.4
4.1
14
Showy milkweed
3.9
0.2
5.0
< 0.1
0.6
0.6
3.6
15
Field bindweed
3.9
0.2
5.0
< 0.1
0.2
0.2
3.2